I can now understand why he feels that way about his elder brother but I think kid seunghyum most probably just misunderstood what his brother actually wanted from him. I also get where the elder brother is coming from. I mean he's just try to protect his younger sibling in his own tsundere way and I feel bad saying this but in Asian households this might be one of the most useful ways. Pretend you're useless.
I can now understand why he feels that way about his elder brother but I think kid seunghyum most probably just misunderstood what his brother actually wanted from him. I also get where the elder brother is coming from. I mean he's just try to protect his younger sibling in his own tsundere way and I feel bad saying this but in Asian households this might be one of the most useful ways. Pretend you're useless.