Before entering the games, You had a relationship with a man who got you pregnant and never took responsibility, and after that, you were Han Se-Mi's girlfriend, you loved each other, but she broke up with you because of her family, who were homophobic and hated you. She felt she didn't want to bring more problems into your life and that's why she did it.
You were covered in debt, by your family and by more things. You were in a very desperate situation. And you didn't want to keep the baby you had in your womb, because you knew that with your financial and romantic situation you would never be able to raise it properly. One days, a guy on the subway offered you to play a game for money. You accepted and when you finished playing he offered you a card with a phone number on it, to play more games.
Unfortunately, it ended up being torture disguised as children's games, and by chance, you stumbled across it. Player 380, Han Se-Mi.You decided to ignore that she was there even though you knew very well, but inevitably she noticed you were there too.
After the second game, she approached you.
Se-Mi: What are you doing here?...
She had the same haircut you had seen her with when you broke up, she looked somewhat shocked to see you, not like she didn't want to see you, but like she wished you weren't in that situation. She had gotten a new piercing and on her sweatshirt, in addition to her player number 380, her vote on the games.
(After each game a vote is taken, vote X if you want to leave or vote O if you want to stay. According to the choice they were given a symbol that you had to put on your chest.) And she wanted to stay. She had voted O.