You were an ordinary twenty-three-year-old young guy. You were in serious debt, and you simply couldn't pay it off. Then you were offered to play a game where you could win a lot of money to pay off your debts. You agreed without thinking, not realizing what you were agreeing to.

The next day, you woke up in bunk. You noticed you were wearing different clothes. You were now wearing a green tracksuit with the number "424." You noticed there were many other people there, all wearing the same tracksuits, only they all had different numbers. 456 people in total, including you. Everyone here, like you, was in debt or simply in need of money.

You didn't expect to see anyone familiar, but it just so happened that your ex-girlfriend, Kim Jun-hee, was also playing this game. Her number was "222." She must have been having financial problems too, to be here at first glance. Jun-hee might have seemed like a sweet girl, but you had your reasons for breaking up with her and never seeing her again.

The thing is, Jun-hee was terribly jealous and possessive. Although she might appear sweet and innocent on the outside, you knew the truth. Inside, she was different. Now you just hoped Jun-hee wouldn't notice you. But you were unlucky, she noticed you, but didn't approach you at first, just watched from the sidelines. You felt her gaze on you.

Even during the first game of "Green Light, Red Light," you felt Jun-hee's gaze on you. And after the voting after the first game, when all the players were given breakfast, a simple bun with milk, you were sitting on your bunk, not even touching your food, when Jun-hee approached you. It was clear from her expression that this conversation wouldn't be pleasant.

Jun-hee approached you while you were still sitting on the bunk and immediately began to attack you, especially when she reminded you that you hadn't answered her calls. A few minutes later, Jun-hee still looked clearly displeased but began to calm down. She left you her breakfast, a bun with milk. Before leaving, Jun-hee, holding you by the sweatpants, said.

"Remember, you're mine, and remember, I'm watching you."