Seoul, South Korea (CNN) Almost 500 North Koreans are in South Korea for the Winter Olympics -- in a land they have been brought up to see as enemy territory; one clearly more prosperous and more free than their own.

It's also a place to which more than 31,000 of their comrades have defected over the past six decades -- a fact not lost on North Korea, which isn't taking any chances with its delegation this time.

The group of athletes, officials, performers, reporters and cheerleaders -- including the younger sister of Kim Jong Un -- will be surrounded by support staff, minders and informants. They're also likely to be vetted, well-treated and loyal members of North Korea's elite.

North Korean athletes have defected before. A women's ice hockey player defected in 1997 and a judo athlete defected while at a competition in Spain in 1999.

While unlikely, it isn't impossible for a member of North Korea's Pyeongchang delegation to defect as the world watches the Games -- and it would be both a huge embarrassment for the North, and geopolitical mess for host South Korea.

More than 200 young North Korean women have arrived in South Korea to root for athletes from both sides of the peninsula at the Winter Olympics.

Defections unlikely

Now living in South Korea after defecting in 2006, Han Seo-hee was chosen in her twenties to be part of a North Korean cheerleading troupe after she performed for late leader Kim Jong Il.

She says it's unlikely that cheerleaders would defect during such a high-profile visit.

The team would be monitored everywhere they go and would be keenly aware of the consequences their family back home would face were they to make such a move, Han says.

"I wouldn't have even considered it." Han says. "It will be the same for the cheerleading squad this time. They have family back home, they know if they defect, their family will be terrified and punished."

"A North Korean group sent abroad is always composed of three parties. Party members, security members and administrative members. This time will be the same."

Photos: North Koreans at the Winter Olympics Kim Yo Jong, center, sister of North Korean leader Kim Jong Un, arrives at Incheon International Airport in South Korea on Friday, February 9. Kim is part of a high-level North Korean delegation attending the PyeongChang Winter Olympics. She's the first member of the Kim family to visit South Korea since the 1950-53 Korean War. Hide Caption 1 of 8 Photos: North Koreans at the Winter Olympics Ryom Tae Ok (L) and Kim Ju Sik of North Korea practice at the Gangneung Ice Arena on February 8, 2018, ahead of the pairs figure skating competition of the Pyeongchang 2018 Winter Olympic Games. Hide Caption 2 of 8 Photos: North Koreans at the Winter Olympics Members of the North Korea cheering group gather before a welcoming ceremony inside the Gangneung Olympic Village before the 2018 Winter Olympics. Hide Caption 3 of 8 Photos: North Koreans at the Winter Olympics North Korean athletes look on during the welcoming ceremony ahead of the PyeongChang 2018 Winter Olympic Games. Hide Caption 4 of 8 Photos: North Koreans at the Winter Olympics North Korea's Vice Sports Minister Won Gil-woo signs the Welcome Wall ahead of the PyeongChang 2018 Winter Olympic Games. Hide Caption 5 of 8 Photos: North Koreans at the Winter Olympics North Korea's Won Kil U offers a gift during a welcoming ceremony for North Korea's athletes. Hide Caption 6 of 8 Photos: North Koreans at the Winter Olympics North Korea's figure skater Ryom Tae Ok (C) stands with her teammates at the athletes village of the 2018 Pyeongchang Winter Olympic games. Hide Caption 7 of 8 Photos: North Koreans at the Winter Olympics North Korean cheering squads wave upon arriving at the Korean-transit office near the Demilitarized Zone on February 7, 2018 in Paju, South Korea. Hide Caption 8 of 8

No time alone

The relentless glare of public scrutiny would be intense -- even intimidating -- for any athlete competing in the Games, which officially begin Friday.

A former North Korean police officer, who didn't want to be identified because he still has family in the North, told CNN scrutiny would continue for the North Korean athletes out of the public eye.

He said team members would be under 24-7 surveillance -- unable to go to the bathroom alone and informants would monitor who is talking to whom.

Han said the very nature of North Korean life means everyone is encouraged to look for unusual or suspicious behavior in friends or family and report it.

"Not only the leaders but also the rest of the performers will be punished for not reporting suspicious signs of a defector."

North Korean athletes take part in a welcoming ceremony for the team at the Olympic Village in Gangneung on February 8.

Intensive training

The North Koreans already in Pyeongchang have been chased by media everywhere they go.

In most cases, they give disciplined smiles and little response to the barrage of questions -- although at Thursday's welcoming ceremony for North Koreans at the Gangneung athletes village some of the delegation were visibly relaxing as the ceremony progressed, even giving the Olympic mascot Soohorang high fives.

Han said she was told not to talk if she went abroad, to ignore journalists' questions and not to make eye contact.

"We were educated that we would be sent to South Korea not only to cheerlead but also to boast about our leader. We were told that we should take the fight to the heart of our enemies."

A North Korean operator wearing a badge with the portraits of late North Korean leaders Kim Il-sung and Kim Jong-il works while North Korea's Samjiyon Orchestra performs on February 8, in Gangneung, South Korea.

Isolated?

The North Korean athletes have taken three floors of accommodation in the Gangneung Olympics village. Each apartment has two or more beds — the North Koreans would not be staying in rooms alone, according to the former police officer.

The athletes have made their presence known by hanging from a window a massive North Korean flag that covers all three floors. Such a move that could land you in jail on a normal day, but these Olympic Games are not normal and the flag is allowed by the International Olympic Committee.

The performing art troupe has been staying aboard the Man Gyong Bong ferry which brought them to the South this week -- an easy way to protect the North Korean orchestra from both protestors and temptation.

But Han says those within the troupe would be from a 'good background' and loyal to the regime so thoughts of defection would be unlikely.

North Korea's Samjiyon Orchestra performs on February 8, 2018 in Gangneung, South Korea. The performers are staying on a ferry that brough them to South Korea.

Scrutiny continues back home

Lee Chul-sung, the head of South Korean police in charge of security for the Games, says North Korea was not allowed to bring its own official security and he has organized a separate field team to accompany North Korean delegations wherever they go.

"I wouldn't go so far as to say the athletes are isolated, but they are separated from the other athletes. We will have extra security for them."

Lee says there are also South Korean guards permanently outside their living quarters to keep the delegations secure. Small protests have erupted wherever they go, with some in South Korea angry the door has been opened to North Korea without the country having to make any concessions on its nuclear missile program.

The North Korean ex-police officer told CNN the surveillance surrounding the North Korea team, performers and officials would be covert and the intelligence officers would have titles like support staff.

The scrutiny and surveillance also wouldn't ease up once they were back home, he says.

The athletes, performers and cheerleaders would be subject to reviews, debriefs, and investigations to find out how each person represented their country to the outside world.