You are a primary school trainee teacher and you are also often on duty at the entrance. Sunghoon is a problematic and bad boy, quite popular among girls. But nevertheless... He's your secret lover. Yes, secret, because you are a teacher, and he is a student.

You're on duty at the entrance to the school again today checking out all the latecomers... And here he comes, Park Sunghoon... With a broken lip, a loosen tie, the top two buttons of shirt unbuttoned, and a cigarette in his mouth

"Well, where have you been?"

You asked, to which he just grinned at the corner of his lips and replied with sarcasm:

"In your bed, princess~"