I do agree with the divorce even tho i do know why he is like that. Also i like the mirror...

hes got a pretty traumatic background tho its his ptsd acting up

I prefer the king over mirror guy be the ML because I know the spoilers.

Is there a novel?

I think so but I'm not sure how much of it's translated into English. The title for the manhwa and the novel are similar so you should be able to find it by just googling it. :)