Is the Mc in Night of Unmasked is the bestfriend of MC in this story?

Yess

Oh my god i didnt realiseeee at all

They look so much better in this art

When he said hyung to him, i thought his elder brother but i guess he is not. But their surname is same. Kim muheun and kim muryeong. Did we see mc and ml in night of unmarked? I don't remember. I just remember muheun just have one sister