He is not some psycho killer. He had a personality break down like Yeri, and killed all of his bullies in cold blood. That's why he doesn't feel bad about it.
He is also in Not To Die manga.
https://www.mangago.zone/read-manga/if_you_don_t_want_to_die/uu/to_chapter-1/pg-1/
The relevant chapter with Ma Kyeom cameo. Needless to say, but TW for severe bullying
This is not a yaoi ma guy
Σ( ° △ °|||)︴ thank u for this information damn
I thought he was gonna say "suck my dick bitch". I mean where did he even get the balls to threaten a guy who murdered 7 ppl and didn't repent.