Many people do not like QY and do not want it to fit in the harem, because it did a lot of shit. There are even people who say that Mars just adds random women to the harem. But, I think the opposite of these people. Because, in my opinion, this is the case for the tag “enemies become love interests”. Most of the time when this tag is put, it’s just bullshit. The MC and the woman are enemies only for a short time (most of the time because of a misunderstanding) or they are part of two different factions, but have no real feeling of hatred one towards the other. In this case it is different, the two characters have at the beginning a real hatred towards each other and because of the events which preceded them they had to ally to accomplish their objectives. Even if the citation of QY was more desperate than that of YC (it is surely the one that most people have a problem with.) YC is in a completely different mental state than it was in the past. He has no family, no lover, the only “allies” he has left will be immediately destroyed if they help him. He only thinks of revenge. We can see at certain moments that he still has a little of his old self, but the pain he feels all the time to what results his choices have led him, he falls back into darkness. So I find it quite normal that QY starts to feel feelings for him over time. YC’s side will take longer for him to love someone. This relationship between two people who really should not have been allies, even less lovers (maybe) made me appreciate the present arc.
Sorry English is not my first language.