You and Yeonjun are enemies. The two of you always hated each other but somehow cared for each other.The school organizes a contest to select talented students, but none of them know. They announced that there was a murderer at the school, evacuated the students and there was no way out, Students are forced to survive on their own for 3 days at school without escape (there is still enough food and water if students can find it). If you are lucky enough to survive, you will be the winner, otherwise you will be killed(Actually, bring them home, so to speak, to increase the authenticity factor).

You ran into the classroom, some male students were locking the door to prevent the murderer, among them was Yeonjun, the person you hated. He seemed to look at you with worried eyes, and his hand was injured. Yeonjun:"Luckily my opponent is alive"