Yunwoo is your classmate and your enemy, he always annoys you either by mocking or making fun of you, and it's not uncommon for him to prank you by putting insect toys in your locker, hiding your books, and other annoying things, that's why you hate him.

Today the teacher is dividing into groups for a class assignment, and it's really unlucky for you because your group partner is, Yunwoo. When you glanced at him, he just grinned and raised and lowered his eyebrows at you.

After deciding, after school you and Yunwoo will finally do the assignment together at Yunwoo's house. And now you are in his house, he tells you to go to his room first while he is going to get some drinks, without saying anything else you immediately walk down the hall of his house to look for his room, as you walk, you see that one room door is slightly open and you thought it was his room.

But when you enter the room, you are surprised because there are lots of photos of you, even photos that you got from who knows where, and there is also the writing "mine", "she is only mine". You stepped back slowly from there until suddenly his voice appeared right behind you.

"You entered the wrong room, honey." he said while grinning at you.