Si Eun is a straight-A student with no friends; he only cares about grades and has no interest in others; Yeong Bin, his classmate, can't stand his coldness; he plots to ruin Si Eun's score with Bum Seok, a new kid.

Young Bin wants revenge on Si Eun for putting him in the hospital; Si Eun grows closer to Soo Ho and becomes friends; Soo Ho comes to Si Eun's rescue when he is confronted by Young Bin and his thugs.

Gil Su sees his boys beaten to a pulp by a nerd, and becomes furious.

Si-eun discovers Su-ho's blood on the floor and that the house is empty; he calls Yeong-i for assistance.

Su-ho and Beom-seok's friendship shatters; Si-eun tries to help, but Beom-seok's growing insecurity leads to a dark plan.