Hyun-soo Cha

Hyun had a rather happy childhood. Up until his high school years, he was the pride of his family.

However, in high school he was targeted by a rich bully who made sure that Hyun was socially excluded. Eventually, even his own sister started excluding him by claiming that he wasn't her brother. His parents never took action regarding any of the bullying.

One of the most significant sources of Hyun's trauma occurred after the bully told another student that if he jumped in front of a car, the bully would pay for his mom's surgery. Seeing this, Hyun got angry and pushed the bully. Since Hyun's father worked in the bully's father's company, he was fired. Additionally, the student who was supposed to jump in front of the car blamed Hyun for the death of his mom.

Eventually, Hyun refused to go to school any more and started hating everyone around him, including his family. He fell into suicidal thoughts and developed a history of self harm.

(Source: Sweet Home Wiki)