Unfortunately, trauma is dealt with differently by people, Jaekyung's way mirrors the trauma, with violence and pushing people away.
That does make him an asshole, but I get where he's coming from, sometimes you don't realize your reaction until it's too late and you've already hurt people, yourself, etc. And when you're already ticked off, everything adds on top and it's even harder to calm down, so it get worse. Hopefully he's learn a bit from his ways and will apologize soon ish at the very least, but we'll see how the author goes with it.
Unfortunately, trauma is dealt with differently by people, Jaekyung's way mirrors the trauma, with violence and pushing people away.
That does make him an asshole, but I get where he's coming from, sometimes you don't realize your reaction until it's too late and you've already hurt people, yourself, etc. And when you're already ticked off, everything adds on top and it's even harder to calm down, so it get worse. Hopefully he's learn a bit from his ways and will apologize soon ish at the very least, but we'll see how the author goes with it.