Because his brother is brainwashing him since he is a baby.
It is like a baby elephant with chains in olds circus
Tell you don't know anything about abuse without telling me you don't know anything about abuse. It is the same tactics that makes elephants who are more large and stronger than humans obey their handlers
You could see he was literally almost killed by his brother in many ways, attempted murders i mean. Even I would freak tf out to say anything. It's called years of abuse that is engraved into you. It's hard to face it.
Why do he have the energy to lashed out the ml(although its good) but why is he so coward to do that to his brother?he should have this attitude towards his brother too.not just the ml..how powerful is his pathetic brother that he’s so scared?i used to like this manhwa but I can’t stand him being so scared to his brother.just his brother.like uggggh..tangina mo haha.just use the ml to bring down your brother.think yigon.you don’t need to be inlove with the ml.