(CNN) In February 1964, an English boy band called the Beatles made its US television debut .

Beatlemania, the intense fan frenzy directed towards the fab foursome, was gripping America and the group's performance at the Ed Sullivan Theater was punctuated by fervent screaming from the studio audience.

In May 2019, over 55 years later, another band of foreigners played the same theater.

The visual similarities were striking -- and intentional.

The Korean newcomers sported the same style of slim-fit suits and floppy bowl cuts, emblazoned their name on their drum kit in the same font used by the Liverpudlian hitmakers, and even made their broadcast in black and white.

But this wasn't the Beatles. It was BTS -- a seven-man South Korean mega-group which is quite possibly the biggest boy band in the world right now.

the third group in 50 years to have three number one albums on the Billboard 200 charts in less than 12 months, joining the ranks of The Beatles and The Monkees. The next month, BTS became the In April, BTS became onlythe third group in 50 years to have three number one albums on the Billboard 200 charts in less than 12 months, joining the ranks of The Beatles and The Monkees. The next month, BTS became the first group in Billboard history to spend five weeks at number one on the Billboard Artist 100 chart.

Like the Beatles, BTS had traveled from another continent to perform for their enormous American fan base. But that the South Korean stars had managed to crack the American market was perhaps an even greater achievement. Most of BTS's songs are in Korean, the group only has one fluent English speaker, and they were selling Americans a distinctly Asian brand of sex appeal.

The K-pop band that could

Six years ago, when BTS released their music video debut " No More Dream " in June 2013, it wasn't obvious that they would be K-pop's breakout success story in America.

The group, comprised of Kim Tae-hyung (better known as V), Jung Ho-seok (J-Hope), Kim Nam-joon (RM), Kim Seok-jin (Jin), Park Ji-min, Jeon Jung-kook, and Min Yoon-gi (Suga), presented itself as rebellious "bad boys," sporting gold chains, bandannas and heavy black eyeliner. The aggressive, rap-heavy track urged young people not to be defined by their parents' aspirations.

South Koreans, however, weren't blown away. The single debuted at number 84 on Korea's government-sponsored Gaon Music Chart.

At the time, boy bands EXO, Big Bang and SHINee dominated the K-pop charts. And while those groups sometimes referenced hip-hop in their songs, they tended to have a more clean-cut image and sing pop songs about romance. In EXO's 2013 hit " Wolf ," for instance, the band members howl and compare themselves to an animal who has been tamed by an alluring woman.

But BTS, who were then all aged between 15 and 20, had something else that set them apart: they had been developed by start-up label Big Hit Entertainment, not one of the big three record companies -- SM Entertainment, JYP Entertainment and YG Entertainment -- which formed in the late 1990s, when K-pop was starting to take off.

To dominate South Korea's ultra-competitive, $4.7 billion K-pop industry, those labels had established intense pop factories that found and developed talent to form money-making groups.

The labels auditioned thousands of idol hopefuls a year, often aged between 10 and 14, who would become trainees at so-called K-pop farms and take part in a grueling, full-time rigorous training program in dance, singing and even make-up. Eventually, the lucky ones were selected for a K-pop group and tied in to long contracts that restricted their personal lives and sentenced them to years of limited pay. They had to conform to the rigid world of K-pop, where members are given designated roles within a group, such as leader, dancer or "visuals" -- the eye-candy of the group.

Like other idol groups, BTS were manufactured. But its upstart label Big Hit Entertainment had to do something different to break through.

Wearing their hearts on their social

From the start, Big Hit Entertainment faced a challenge.

Lacking the industry connections and big money of the industry giants, the label relied heavily on social media to promote the group.

KNOW YOUR K-POP SLANG Maknae: Korean for "the youngest." The maknae in a group is often treated protectively by older members.

Korean for "the youngest." The maknae in a group is often treated protectively by older members. Golden Maknae: A nickname given to BTS's Jungkook -- the youngest member -- that celebrates his talent for singing, rapping and dancing.

A nickname given to BTS's Jungkook -- the youngest member -- that celebrates his talent for singing, rapping and dancing. Hyung: Korean for "older brother." To a maknae, all other members are "hyungs."

Korean for "older brother." To a maknae, all other members are "hyungs." Visuals: A member whose role is being the eye-candy.

A member whose role is being the eye-candy. Bias: Your favorite member of a group.

Your favorite member of a group. Bias wrecker: The member of a group who makes you question your devotion to your bias.

The member of a group who makes you question your devotion to your bias. Stan: A massive fan of an idol or group, a word derived from rapper Eminem's song "Stan," about an obsessive fan.

BTS were one of the first K-pop groups on Twitter, says Michelle Cho, a professor of East Asian Studies at University of Toronto. The band also posted vlogs on YouTube and shared the minutiae of their lives on Korean livestreaming platforms AfreecaTV and V Live.

In one clip, singer Jungkook makes instant ramen in a modest kitchen. Using tongs, he pulls a noodle to his mouth. "It's perfect," he says. In the past 10 months, that V Live clip has been viewed over 7.6 million times

The internet is full of these kinds of mundane BTS moments: the members cuddling as they snooze, eating meals, sitting in taxis and pulling pranks on each other. They take a variety of forms -- casual posts, live-streamed video diaries, or produced episodes of their reality TV-like web show "Run BTS!"

"I think that for some people it's quite alienating to encounter other K-pop (groups) ... that they know are a product of this very rigorous training system that (they believe) makes them a bit less authentic," Cho said. "BTS are quite different because their whole concept from their inception was that they were going to be honest purveyors of the experience of youth."

The videos build up seemingly authentic characters for the members: V is the quirky one, Jimin the flirty one, Jungkook the supernaturally talented youngest member. J-Hope is high-energy, Suga the brooding musician, Jin the handsome one, who often reveals himself as a pun-loving dork. And RM, the preternaturally mature group leader. Among fans online, the members are often represented by a different animal emoji.

"They're superstars, but they have a human side as well," says YJ Chee, a 24-year-old Singaporean based in the US who describes himself as a member of ARMY, the name BTS uses to refer to its fans and an acronym for "Adorable Representative M.C. for Youth." "It makes them relatable."

Of course, it's easy to be cynical about the authenticity of the image they present online. BTS are closely managed and never mention their romantic lives. But the clips have created a kind of intimacy between BTS and their fans that other K-pop groups have since tried to imitate.

"They don't distance themselves that much from their fans," says David Kim, who runs YouTube channel DKDKTV where he analyzes K-pop. "They just show themselves how they are -- they show the good and bad. I think that's what's different from other idols."

And with the Korean market lukewarm on BTS, that ARMY helped the band break America.

Becoming a household name

BTS looked abroad early. In 2014, while still relatively low profile on home turf, BTS began chipping away at the US market. They were a breakout success at that year's KCON, a K-pop convention in Los Angeles, where they performed in schoolboy outfits. Their music made nods to hip-hop and electronic dance music (EDM), genres that were popular in the West.

Photos: The rise and rise of K-pop boy band BTS BTS during their debut showcase on June 15, 2013, in Seoul, South Korea. Their style has undergone some changes. Hide Caption 1 of 12 Photos: The rise and rise of K-pop boy band BTS Singer Park Ji-min -- better known as Jimin -- exposes his six-pack as BTS perform during their debut. Hide Caption 2 of 12 Photos: The rise and rise of K-pop boy band BTS BTS attend KCON, an annual Korean pop music convention, on August 10, 2014, in Los Angeles. BTS were a breakout success at the convention. Hide Caption 3 of 12 Photos: The rise and rise of K-pop boy band BTS BTS pose on the red carpet of the 2015 Mnet Asian Music Awards in Hong Kong on December 2, 2015. BTS scooped the award for World Performer. Hide Caption 4 of 12 Photos: The rise and rise of K-pop boy band BTS BTS make their US television debut at the American Music Awards on November 19, 2017, in Los Angeles. Hide Caption 5 of 12 Photos: The rise and rise of K-pop boy band BTS The group perform "DNA" at the American Music Awards on November 19, 2017. Hide Caption 6 of 12 Photos: The rise and rise of K-pop boy band BTS Following their American Music Awards performance, BTS appear on a handful of US talk shows. Here, BTS perform on Jimmy Kimmel Live! on November 29, 2017, in Los Angeles. Hide Caption 7 of 12 Photos: The rise and rise of K-pop boy band BTS BTS perform "Mic Drop (Steve Aoki Remix)" on Jimmy Kimmel Live!. Hide Caption 8 of 12 Photos: The rise and rise of K-pop boy band BTS BTS become the first ever K-pop group to address the United Nations at the UN General Assembly in New York on September 24, 2018. Leader Kim Nam-joon urges young people to believe in their own convictions. Hide Caption 9 of 12 Photos: The rise and rise of K-pop boy band BTS BTS attend the Grammy Awards where they become the first K-pop group to present an award on February 10, 2019, in Los Angeles. Hide Caption 10 of 12 Photos: The rise and rise of K-pop boy band BTS BTS become the first K-pop group to perform on Saturday Night Live on April 13, 2019. They perform their new single "Boy With Luv." Hide Caption 11 of 12 Photos: The rise and rise of K-pop boy band BTS BTS with US-singer Halsey at the Billboard Music Awards in Las Vegas, where they became the first K-pop group to win Top Group/Duo on May 1, 2019. Halsey features on BTS's single "Boy With Luv." Hide Caption 12 of 12

BTS toured again in the US in 2015 , and in 2017 -- now sporting their trademark colorful hairstyles -- they went back for their biggest year yet stateside, becoming the the first K-pop act to win a Billboard Music Award and make the top 10 of the Billboard 200 charts. In November 2017, they made their US television debut, performing at the American Music Awards.

They weren't the first K-pop group to try to break the overseas market. YG Entertainment's Big Bang had gained some overseas success, winning Best Worldwide Act at the 2011 MTV European Music Awards, and in 2012, becoming the first K-pop group to break into the Billboard 200 chart.

But the personal connection with their fan base established through their social media presence gave them a huge advantage, says Cho. The BTS ARMY began to act as a network of unpaid translators, producing English subtitles and texts of their content, connecting BTS with their non-Korean speaking audience.

The rise of BTS

June 2013 BTS are founded. They release their first music video for "No More Dream."

August 2014 BTS play at KCON, a Korean pop music convention, in Los Angeles.

October 2016 BTS's music video for "Blood Sweat and Tears" breaks the record for fastest YouTube video to 30 million views, and the most number of views for a K-pop video in a 24-hour period.

February 2017 During their Wings Tour, BTS become the first K-pop group to sell out arenas in the US.

May 2017 BTS become the first K-pop group to win a Billboard Music Award after taking the trophy for Top Social Artist.

November 2017 BTS perform at the American Music Awards, their first performance on an American awards show. BTS appear on The Ellen Show, Jimmy Kimmel Live!

April 2018 BTS win the 2018 Time magazine reader poll.

May 2018 BTS become the first South Korean act to top the Billboard 200 chart with their album "Love Yourself: Tear."

September 2018 BTS become the first K-pop group to address the United Nations.

February 2019 BTS become the first K-pop group to present a Grammy Award.

April 2019 BTS become the first K-pop band to perform on Saturday Night Live. BTS become the third group in 50 years to have three number one albums on the Billboard 200 charts in less than 12 months.

May 2019 BTS become the first K-pop band to win Top Group at the Billboard Awards.



Source: CNN reporting



BTS's Twitter posts aren't in English, but today the group has over Most ofBTS's Twitter posts aren't in English, but today the group has over 20 million followers on the platform, more than Beyonce or UK hit-maker Ed Sheeran . Individual BTS members don't have social media accounts, meaning the group's fan following was concentrated on one account per platform.

Cho believes it was the group's large social media following that got the US TV shows interested.

"(BTS) really had to rely on their fans to be their advocates whereas other groups had a bigger machine behind them," Cho adds. "I think it was ... the power of their numbers of Twitter followers ... which really brought them a lot of media attention, which helped them become a household name."

An ecosystem of fans

BTS aren't just savvy at social media -- to their fans, they are trailblazers within the K-pop genre.

While K-pop hits are mostly not written by the band members, many BTS songs have one of the members credited as a writer or producer, particularly J-Hope and former underground rappers Suga and RM. But more importantly, their songwriting -- particularly in their earlier works -- goes beyond the love-lorn lyrics of some other pop hits.

In 2014's " Spine Breaker ," BTS hit out at young people who are using their parents' money to buy expensive things. In 2015's " Baepsae " they rebuke the older generation for promoting the idea that the younger generation are lazy. In 2018's " Idol " they discuss the importance of loving yourself, regardless of what others think.

BTS's works also often reference literature or philosophy. Their latest album, "Map of the Soul: Persona," is a reference to the work of psychiatrist Carl Jung -- and even the album's party hit " Dionysus ," ostensibly an ode to getting drunk, references the Greek god of wine.

As new fans tuned in to BTS, they found a group with elaborate music videos and experimental fashion that sometimes bordered on feminine, at least to Western eyes. Both on and off stage, BTS members wore chokers, blouse-like, silk shirts and visible makeup that made them look glossy and beautiful in a way that didn't necessarily fit with the the traditional Western conception of masculinity.

"The more time fans spend thinking about all of the different elements that go into the group that they're interested in, the stronger that attachment will be," Cho says. "I think it's a really potent mix, you're not just a casual fan of BTS, you have to be initiated into their world and then you get sucked in."

Another BTS?

To some, BTS' success is a sign that the so-called hallyu wave -- the global popularity of South Korean entertainment -- isn't just coming, it's crashing upon US shores.

In April, Korean foursome Blackpink became the first female K-pop group to play Coachella Seven of the top 10 artists on Billboard's social charts for the first week of June came from South Korea.

But the effects of BTS's breakout success might be broader. Some of David Kim's 500,000 subscribers have also told him they're learning Korean to better understand BTS's message.

"I feel extremely proud, the Korean pride is exploding," David Kim says. "It's absolutely unbelievable. If you think of this small country ... and this small group that doesn't even speak English, spreading all this Korean culture and topping the charts and stuff, it's just unbelievable."

Cho says BTS's aesthetic, which is a representation of East Asian masculinity, is helping to change what mainstream viewers think about the possibility of gender presentation and what Asian bodies represent.

Suk-young Kim, Director for the Center for Performance Studies at the University of California, Los Angeles (UCLA) thinks BTS are doing a lot for Asian males, who haven't always been presented well in US media. "BTS's ubiquitous visibility and positive image will do much to create cool 'Asianness,'" she said.

But she cautions against seeing BTS as a game changer for K-pop overall.

Photos of BTS member Kin Seok-jin, better known as Jin, are displayed at a subway station on June 2, 2018 in Seoul, South Korea. Fans often pay for ad space to celebrate the anniversary or birthday of their idol. In this case, they are celebrating Jin's 5th anniversary of his debut with BTS.

"BTS and K-pop should not be bundled up together," said Suk-young Kim. "BTS, in a way, has been breaking a lot of the conventional molds of K-pop."

Some fans feel the same way, pointing to how BTS were never especially popular in South Korea, and instead had to rely on the online fandom to break into foreign markets.

Kim believes the next BTS isn't coming anytime soon.

"Currently (BTS) are being compared to The Beatles and that is just crazy," he says.

"The Beatles in world history are one of the top, top groups. And a K-pop climbed up the ladder up to that level. I think it's going to be unrivaled for at least decades."