There were 2 red guys, one Chaesoo's ex Taesoo, and the other one, Woojin old friend Yitae, and spin off will be about that Yitae, and I believe that black hair guy is Chaesoo's older brother Jiwoo, but we'll see, either way, I hope it will be less frustrating than the original
Who was the red haired guy? I didn't finish the story because I was so pissed off