Weak Hero Class 1

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 sees Soo Ho's blood on the floor and calls Young Yi for help. Gil Su tells Seok Dae to come, so Young Yi follows him with her GPS tracking app on. Meanwhile, Soo Ho and Bum Seok are tied up by Gil Su's gang.

While hanging out in a karaoke room with his friends, Bum Seok runs into the bullies from his previous school; Soo Ho makes them apologize, but Bum Seok isn't happy with Soo Ho ordering him around.

Bum Seok befriends Jeong Chan and Tae Hoon, he reeks of alcohol every day. Si Eun thinks Bum Seok is being used by Jeong Chan and Tae Hoon. He also thinks Bum Seok is behaving that way because he is lonely. Si Eun wants to help Bum Seok, but Soo Ho thinks he's done enough. Meanwhile, Bum Seok pays Woo Young to beat Soo Ho on his birthday.