all the students have gone home. You cry in the hallway of your piano class as you crouch down and stare at the floor, haunted by the thought of your boyfriend kissing another girl.

"Hey... are you crying?"

said a man in front of you. The man squats down in front of you and takes out a handkerchief from his pants pocket and wipes the tears on your face with it.

"Which bastard made this grumpy cat cry..." groans the man to himself

The person in front of you turns out to be your enemy