He is your academic rival.

The results of the chemistry exam you took were announced and you had to get a perfect grade. But you didn't get the grade you wanted and came second in your class. That made you incredibly angry and you left the class quickly. You started to cry as you tried to find a quiet place for you. After a while you heard a man voice.

"Dont cry."

It was Heeseung. The boy who got a better score than you