Maybe because he knows that min jiwook is someone important to seungho. So in his perspective if he got his hand on MJ that will mess up S. But in the recent chapters it seems like he came to be obsessed with MJ that getting back at S wasn't his main priority ╮( ̄▽ ̄)╭
Ok I get he don’t like mr rich dude but y is he getting the other kid who is broke involved