I'm dumb. Who's the red hair one and who's the perv in the bed

perv is that guy who cat don’t like him’s brother, red hair i think is a friend from school

I think they are both past friends of woojin. Woojin used to like perv in bed- got his heart broken because he didnt feel the same... and I think red head guy teases woojin alot? I'm still a bit confused with red head tbh but I hope this cleared something up (⌒▽⌒)