beta
Taeha didn't hit Aeil because of the tattoo, he hit aeil because aeil mocked taeha for not being able to protect the MC despite the fact that he acts as MC's owner. It wasn't about the MC, it was about Taeha, which basically implies Taeha cares more about the impression he makes on others rather than the MC's own integrity and well being. Which is what makes the MC slap him, he knows taeha isn't doing it because of love or affection, he is doing it for power, possession and control.