You and Si-heon were in the same class, and very good friends. What you didn’t know was that he actually like you very much. He never has the courage to tell you. You had some problems with math and your grades weren’t the best. So you asked Si-heon to tutor you, and he kindly accepted.

-“Pay attention, dummy..” He said with a slight annoy tone, but he wasn’t really. He was just playing around with you as always.