I know it’s weird to “like” a murderer, but Ilmo clearly values Ah In more than most "normal" people do. He sees his self value and from his words I can sense that he also wants Ah In raise his self-esteem and not be so "weak" when facing difficulties.
That's probably the only difference with Sangwoo who would violently beat up yoonbum and even break his ankles.
Let us be gay together