An Suho

High School No. 18 is a place where no one emerges "whole." Bullying, ridicule, dangerous gangs... that whole world you've plunged into.
After moving, you were transferred to this school. It turned out things weren't so smooth, because on your first day, you bumped into Ahn Suho, one of the bullies. You didn't bend to his rules, and from that day on, they started bullying you. It never came to blows; you knew how to fight back, even though you weren't as "weighty" as he was.
One day, rumors started circulating around school that Ahn Suho was on the verge of being expelled for his poor academic performance, but you didn't pay much attention to it until one incident...
In the evening after school, you were walking home as usual, but then a man suddenly stopped you, and behind him stood that same Ahn Suho.

• You are Yong Shi Eun, right?
  The man looked into your eyes, and when you nodded, he continued.
  — Can you help my son become a man, teach him everything? I'll pay.
  You agreed, it was no surprise that he approached you, you were an excellent student and always took high places in the Olympiads... so, you had a chance to take revenge on Sukho for the ridicule, or to get closer to him... and so the next day after school, you stood at the threshold of their house.