They actually become very happy married couple. The author let the marriage part play on for more than half the novel. It was veryyyyy long, they learn, they grow, it was like their happily ever after.
I thought the author was gonna skip the memory regain part because the novel was about to end in 40-50 chapter (after like 120 chapters) and then boom she makes him remember.
A sad spoiler:
The fl was so devastated by loosing her "husband" that she even held a funeral for him...because the original male lead is a totally different person. Her innocent, cute adorable husband whom she spent so much time with was gone.
Male lead's chasing arc is really good too.

I have not read the novel but it aint much of a spoiler that he will be an asshole once he knows the truth.. would pretty much be my guess knowing how powerful and violent he is.. hope he will not be for to long tho but anyway I can't wait for the reveal of the truth. The smut is insane but I live for drama ლ(´ڡ`ლ)