Responses
Yeah like why would the mc think he was betraying his older bro by liking this guy, when the older bro always acted like he could barely stand the gangster guy (and moreover, when there a more than believable, legit reason to assume the older bro even secretly hated the gangster guy). At that age, you don't know "tsundere" behavior (or whatever y'call it) even exists... He couldn't help taking the "disgusted" reactions his older bro showed at the guy, at face value.
I dont get why people are mad at the little brother for liking this guy. His brother had shown zero interest in him. And the kiss was pretty innocent. Not to mention, thats his fucking fated partner probably cant help it.