Jun-hee dated a popular YouTuber known as Myung-gi, who became involved with a cryptocurrency. She bought Dalmation coin at his behest and lost large amounts of money when it was revealed to be a scam. She broke up with Myung-gi soon after.
At an unknown time, Jun-hee got pregnant because of Myung-gi. He knew about this and told Jun-hee to get an abortion, but she didn't. After Myung-gi vanished for six months, Jun-hee believed he had died, likely murdered by someone who he scammed.
She plays ddakji against a salesman, a game she is very skilled at, causing her to win more times than him. She receives the card from him and heads to a gynaecology appointment, where she attempts to call Myung-gi, but he does not answer, provoking her to leave before seeing the doctor. Unbeknownst to her, Myung-gi was approached by a salesman at the same time.
Squid Game
Jun-hee wakes up in the Dormitory and recognizes Myung-gi as he is confronted by one of the guards, and then again by two of his former subscribers - Thanos and Nam-gyu - who he scammed. However, she does not reveal her presence to him.
The contestants all participate in Red Light Green Light, and Jun-hee hides in a line behind Jang Geum-ja. She begins suffering from severe stomach pains causing her to accidentally nudge Geum-ja, however the older woman is understanding and tells her to lean on her for support. Jun-hee successfully passes the game despite the pain and votes 'X' to end the game. Afterwards, Geum-ja goes to her and gives her the egg from her meal, having deduced she is pregnant, and tells her the pain is because Jun-hee is purposefully compressing her stomach. She tells Jun-hee to come to her if she needs any help before her son appears and takes her away.
Jun-hee sees Myung-gi being beaten up by Thanos and Nam-gyu before player 001 stops them. She goes over to him soon afterwards, believing Myung-gi had been purposefully ignoring her, only to learn he had not noticed her. He is confused why she would need to be there, but she reminds him he scammed her too, he is also annoyed to learn that she never got an abortion. She tells him that he is the reason she cannot return home and keep their baby safe, as he voted 'O', and that she did not go see him to reconcile, but to see his injuries.
When the next game is revealed to be a team game, Jun-hee is left alone due to having made no allies. Myung-gi approaches her and asks to team up, but she refuses, instead correctly deducing which team would accept her because she is pregnant instead of reject her. She approaches Gi-hun, 001, Jung-bae and Dae-ho and asks to join their team; despite just having picked a fifth member, they agree to help her. As the pentathlon's games are revealed, the team asks her to play gong-gi, classifying it as a girl's game. However, she replies that she does not know how to play, instead asking to play ddakji. The team are demoralized when the first few groups are killed, but they are later shown supporting the first winning team. They are the final team to go, with Jun-hee managing to pass ddakji with the first throw; eventually, they all successfully cross the finish line even with Jun-hee's stomach pains returning. Their celebration is cut short when the team opposite them is executed for being too slow.
Jun-hee shares her name with her team as they all discuss themselves and cement their alliance. At the voting, Jun-hee again votes 'X' to leave the game, and Myung-gi changes his vote to 'X' because of her. However, 'O' still wins, and although Myung-gi stays behind when the groups dissipate, she does not talk to him. During the night, Jun-hee has to go to the bathroom, but is nervous due to her team being all-male, so Geum-ja says they can go together. After the guards refuse to open the door to Jun-hee, Geum-ja purposefully makes a scene to force them to open the doors, and the pair are joined by Geum-ja's ally Cho Hyun-ju. Hyun-ju notices Jun-hee's odd behaviour and stomach pains, and asks what is happening, with Geum-ja admitting the truth. When Jun-hee stays in her bathroom stall for a long time, Geum-ja becomes worried and enters to find Jun-hee sobbing, as she is terrified for her child and herself; Geum-ja hugs and attempts to comfort her. The scene moves Hyun-ju, who regrets voting 'O'.
The next game is 'Mingle' and Jun-hee sticks with her chosen alliance of 001, Gi-hun, Jung-bae, and Dae-ho, however the first number is 10 causing them to join with Hyun-ju's four person alliance consisting of her, Geum-ja, Kim Young-mi, and Park Yong-sik,with Hyun-ju securing Seon-nyeo as the final member. Seon-nyeo notices Jun-hee holding her stomach and gives an ominous prediction about everyone being there for a reason. When the number is 4, 001 splits from the group to allow them to survive, and Jun-hee is relieved to discover he also survived the round afterwards. The five joke about her unborn baby possibly counting as a sixth member of the group, whilst Myung-gi watches. When the next number is six, the groups join together and quickly sort out a solution, however Jun-hee's group is unable to find a free room until the end of the time. In the confusion, Young-mi is knocked over and left behind, and as Hyun-ju attempts to leave to save her, Myung-gi enters and shuts the door. Young-mi is shot and killed, and a distraught Hyun-ju blames Myung-gi, however Jun-hee defends him, supporting his argument that there was not enough time for Young-mi to reach their room. After the round ends, Myung-gi thanks Jun-hee, but she states he was merely right and she was not defending him. The next and final number is 2, and Myung-gi grabs Jun-hee's hand as they find a room together.
When everyone returns to the dormitory, Myung-gi pulls Jun-hee aside and asks to start over with her, stating that the 'X' team will likely win the vote and their conjoined prize money with remove his debt. Jun-hee believes he simply wants to use her money and will abandon her and the child, especially when he begins talking about his new investment scheme, and leaves. Thanos and Nam-gyu see the pair holding hands whilst talking, and deduce they were likely romantically involved. During the vote, Jun-hee again votes 'X', only for the vote to be a tie. Unbeknownst to her, in the bathroom Thanos uses what he deduced about her to taunt Myung-gi, who defended a player against him, provoking a fight.
Jun-hee listens to Gi-hun's plan to hide under the beds and wait until the guards enter to stop the inevitable attack from the 'O' side, then attack them and steal their guns. Once everyone prepares, Jun-hee goes over to Myung-gi and tells him not to fight, instead to hide the entire night even when the guards arrive, to which he agrees.
Gi-hun's group successfully overpower and kill the guards, once prepared they ask for people who know how to fire guns to help them; Jun-hee shakes her head at Myung-gi so he does not volunteer. After the group leaves, she and the those who stayed behind hear the gunshots and ensuing fight.
She was not among the players who would be involved in the rebellion, because she was pregnant with her unborn child and she didn't want her child to die in the rebellion, so she chose to stay in the dormitory. This allowed her to survive when the guards executed the players and overpowered the rebels.
Kim Jun-hee
