@mgdae I'm p sure ML is okay with himself just staying as MC's side piece, he just likes the MC that much he's not bothered by MC's "husband" but still wants to outperform him and has this lil competition with the fake husband in his head? he still gets possessive when he sees the MC alluding to the fake husband in any way (like when he notices the ring or the keys or whatever) but what I understood is that he just wants a piece of the MC that his jealousy doesn't matter so he accepted the relationship
MC however actually likes ML, he's not aware of the misunderstandings and thinks that they're just in a monogamous normal relationship
at least that's how I remember it, I might be wrong so my bad for that lmfaooo