Responses
I was wondering the same thing. Because the red head seems more of a bottom than the actual bottom. Mujin is unquestionable, top all the way.
Yes, also in lots of bl manhwa, tops don't have nipples. I don't know what but nipples seem to be a bottom's thing xD
But indeed Mujin couldn't be a bottom even if he got isekai-ed for 12 generations lol
So ... Question time
...just to confirm my theory...
The red head mc is actually the bottom and the meant to be bottom of the storyline in the story is your usual nippleless top?