If in our real standard that might be the case but the author made it believably skilled when that sussy hyung made both the main character doubt themselves instead of the instigator. He knows where to poke the nest and take advantage of the vulnerability of others for his own agendas. He even utilizes carrot and stick for sohm to be emotionally weak to his whims. Yet the only thing he can’t manipulate is sohms heart since that one required sincerity so he’s brute forcing it by switching his attacks now to geon which we can already see broke his spirit right away.
Not bad despite having not much screentime yet, the villain already packed quite a punch and believably so.

That hyung gives me the major creep, his gaslighting is godlike i get goosebumps reading it! Not only sohm i feel like he’s about to condition their baby bro to be dependent on him not even his good looks can save him from giving the diddy vibes… Still, kudos to the author creating such a villain its been a while i held my breath reading like if i can i want to scream at sohm to runnn!