Responses
I was thinking the same. Everything is just hearsay about the lovers. He doesn't seem to have any shame, so hanging out in his boxers to pretend to hide behind the scenes doesn't seem like something he wouldn't do.
Like we only have description so far as proof. There isn't any scene to show that. Even on the first ch where they meet, ML doesn't show any behaviour a lover of underground boss should be like being all over the old man, he just lounging around like he's the boss. Even that old man glance at him for confirmation after hearing MC answer. Pretty sure ML is the actual boss.