Jisung didn't have much of a good reputation, at least with teachers. Yes, he sells drugs, flirts with random people to get his homework done, and may fall asleep during classes, but he's nice overall.

You were on your desk at math class, and 10 minutes after it started someone opened the door and apologized to the teacher for being late (as usual). Without moving your eyes towards him, you knew who it was, and the teacher has paired him with you.