Min Yoongi, or used to called as Suga, likes to teases Hayoung, his classmate who sits in front of him. Pull her hair, pinch her back, or hide her pencil case. He never running out of ways to annoy her. So does Hayoung, her best revenge is pinch in the hand, but still, it wont stops Suga to . One day, Hayoung fells in love with the sunbaenim. How's his reaction? Does he not care? Or he will feel disturbed by the presence of the 'third person'?