
From what I understand and read from the novel…
(Here the link for reading in English: https://mangatoon.mobi/en/detail/742618/episodes)
…Niannan will have a very bad mental breakdown (like REALLY bad to the point to start screaming and act like crazy) or will get hurts after when he and Yansheng will sign the divorce papers (after he threatened to kill himself after all the abuses from Yansheng and his mother) and his mother is a real snake. She tried to manipulate him to don't divorce Yansheng using his father company and good heart.
Niannan seriously need to be protected until the end.

I wanna slap so bad Yansheng 'till my hand becomes red because, you worthless piece of shit, don't ever raise your filthy hands again on Niannan.
I hope that Niannan will divorce from him, get seriously help from his friends and everyone around him, found love again and make him suffering if he would ever comeback to him.
Niannan is too good for Yansheng and it's still fighting for their "love" while all he does is cheat on him and make him feels like shit.
I think that Niannan is suffering from some kind of stockholm syndrome or things like that because he does everything for make him fall in love or love him.
I hope that he suffers because of the truth about his mistress and the loss of the true love towards him.

I think that I'm reading this more out of the curiosity than enjoy the manhwa. This is always a loop:
square one-progress-happens something-back to square one.
POTN has so many potential for be one of its kind or something like that but this is just a TOXIC relationship and don't try to search for the justification for "dom"'s behavior.
https://mangatoon.mobi/en/detail/828313
Enjoy the swearing that you'll throw to the characters that aren't Niannan and his close friend.