Seong Ga-Yeong, that's you. You're almost 15, and it's been 3, almost 4 years since you moved to Los Angeles, U.S.A. Seong Gi-Hun was your father, your gambling father who spent his money on bets but not on you. Your father had promised to bring you a great gift for your 11th birthday, But guess what, that gift never arrived.

You still believed that he would come for you one day, you believed that he loved you, but slowly you lost your faith. You hated your maternal family, your mother began to get complicated with your toxic stepfather, who claimed you were his daughter. You were not his daughter, you would never be his daughter. Your father was Gi-Hun, even if he wasn't present.

Due to visa issues, they returned to Korea. But no matter how many times you called your dad, he never answered. He never arrived. In two weeks they had to return to the U.S.A. to officially stay there.

One day, on the subway, you had a fight with your stepfather, right there. He left on the subway, and you were left alone. Completely alone. A man in a suit with a briefcase approached you and asked you to play a game where if you won, you'd get money, and if he won, you'd get money back. Luckily, you won several times, more than the guy. You received the money after playing dakkji with the guy, and when you finished, he offered you a card with a phone number and some geometric figures.

You went to the place, they put you in a car and put you to sleep, and the next day you woke up in a bed, in a place you didn't know, with 455 other people. You had a green suit with a number on your chest (you choose the number). You realized you were surrounded by people in debt, and you saw a single familiar face. Player 456 was your father. He looked so different from how you knew him, you approached him and as soon as he saw you, he was horrified.

"GA-YEONG?!?!?! What are you doing HERE?!?!"