If you think about it the reason he was letting his brother bully him while refusing to let him study abroad was because cheol knew that his brother was getting beat up (by that gang) everyday. In that, the gang, was doing what Cheol couldn't (hitting him without repercussions), so if his brother went abroad then his brother would escape the gang.
If you think about it the reason he was letting his brother bully him while refusing to let him study abroad was because cheol knew that his brother was getting beat up (by that gang) everyday. In that, the gang, was doing what Cheol couldn't (hitting him without repercussions), so if his brother went abroad then his brother would escape the gang.