
I just come back from the raws. Poor Dohu.... My heart hurt for him ┗( T﹏T )┛
He lacks of emotions. He can't process the emotions like normal people do. His sister try hard to make him handsome (clothes, hairstyle, etc..) because he was bullied through his school year. Elementary to high school. Either other students stayed away from him or bullies just doing whatever they pleased. He can't react normally, people around him can't accept that.

Sure. Toonkor
Here's the link: https://toonkor441.com/%EA%B3%B5%EA%B3%BC_%EC%82%AC%EB%8A%94_%EA%B5%AC%EB%B6%84%ED%95%B4!_55%ED%99%94.html
I translate it using app Bubble Translation.
Narcissism oh Narcissism (〜 ̄△ ̄)〜
He knows he's the abuser, yet he still thinks he can't be that wrong. He's like, "Well yes I did that and make this guy this bad, but it's not entirely my fault tho"
He has antisocial personality disorder so it's harder for him to empathize with other people's feelings
Since he knew he's not normal but give the pain on others, he's just a literal asshole then ┑( ̄Д  ̄)┍