Perfect Buddy (the Comic / Manhwa) Vol. 6 -

Baek Youngchan has always been intimidating, even as a teen standing up to his abusive father. He's used to people being scared of him--but he never wants Seo Hyunsoo to feel that way. In fact, he wants to be with Hyunsoo forever. Just as Youngchan decides to bare his feelings, Hyunsoo is kidnapped by the psychotic CEO who tried to poach him from City Casual. Now Youngchan, who's always fought to keep his violent tendencies buried, can't stop himself from doing whatever it takes to rescue Hyunsoo, even if it means unleashing his inner beast.