The hype train is running at full steam as millions of fans are waiting for the release of K-Pop superstars BTS's new record.

South Korean boy band BTS blew fans away with a teaser for their upcoming video just four days ahead of the highly anticipated release of their seventh studio album.

The 46-second teaser features American electropop sensation Halsey and sees her finishing her shift at a ticket booth. As she walks away, she stops and takes a look at the seven-piece pink-clad band, all of which fit on a sofa in the middle of the street.

The video ends with BTS standing with their backs to the camera under a neon sign reading "Love". The song is titled ‘Boy With Luv' and references their 2014 track "Boy In Luv"; it is set to feature on the band's new album, Map of the Soul: Persona, which will come out on Friday, 12 April.

BTS and Halsey's collaboration came as a huge surprise to their fandom, which numbers in the tens of millions (they prefer to call themselves an army), and they inundated social media with quite a number of wholesome messages.

MY POOR WIG I CAN'T WAIT ANYMORE — paula ❁ (@paulaxsykes) 7 апреля 2019 г.

— αgʑ loves jungoo 🌷 (@borahaejeonjk) 7 апреля 2019 г.

honestly shocked u kept this a secret — el (@ellieliima) 7 апреля 2019 г.

OMG OMG OMG OMG OMG!!! 🔥🔥🔥🔥🔥🔥🔥 pic.twitter.com/ACiBJwhJ5g — ARMY PERÚ 🇵🇪✨ D-5 📀 (@ARMYPeru2) 7 апреля 2019 г.

The record is going to become the septet's first since the release of their three-year Love Yourself trilogy, which wrapped up with the final part, Love Yourself: Answer.

The latter debuted at number one on the US Billboard 200, moving on to become the first Korean album to score a gold certification. It also topped charts in South Korea, Canada and Japan.

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The hugely popular band will make their Saturday Night Live debut on Saturday, the day following the release of Map of the Soul: Persona, appearing there as musical guests. BTS are also set to perform two sold-out shows at the Wembley Stadium in June. They had to add another date after the first one sold out in just 90 minutes.