There are spoilers here and i don't know how to hide them.
Ok so, the writing and the background are good and the story it's interesting but, i just can't read anymore.
I'll say it just as i wrote it in the comments: it feels as if i'm watching a rape victim forgive and fall in love with the criminal.
Yes, i heard the real rapist was the brother of the guy and is a misunderstanding, but it's only found out until chapter 60 something? So you must pass all those chapters feeling like vomiting everytime the guy flirts and is shameless?
Moreover, the MC who is a cultivator, somebody who must be at least a little smart after all those years... yet he feels bad for the guy and his gift, he allows this "scum" near his beloved sister and accepts his advances even though he despises him. And all this happens BEFORE knowing it was not him. Meaning, even if it was him it wouldn't matter, it would still be "ok".
The fact that it was not him feels more like an excuse so they can be together without disgusting the readers.
The other stinky shoe is the sister, she apparently knows about the future apocalipse, knows the guy (her fiance) doesn't love her but her brother (mc) and forgives it while "knowing" the guy is scum... It was alright because she told him to stay away from her family (because it seems the guy is also the reason of the death of her brother in the apocalipse) BUT, then she tells him to pretend to still be together to not worry the mc while he's hurt... If she's from the future she must know her brother is in a forced relationship, what part of seeing your rapist face can make you feel good? And if she knows about the guy not being the real rapist, why not tell your brother so he doesn't has to deal with it? She is like: i'm worried you'd feel worry for my relationship with your sexual predator so i'm bringing him home where he can harras you to prove you we are fine and you can rest easy and heal.
I must say, i saw great potential in the author from how it was written, but the two major flaws in this story are:
1. The misunderstandings in a story are to make drama and keep you interested in it, not to make you feel grossed out for more than 50 chapters. This is a clear example of how not to make a misunderstanding in the plot.
2. The inconsistency in the characters, how if you say a character it's "this way" and then make them act as if they have no common sense inside their own character. If you love your family and they are the most important to you, you don't let scum take advantage of them or of you when you are perfectly aware of it without a fight (would you rather lie to your sister and hide her scum fiance actions knowing it'll be worse once she finds out? Instead of letting her cry and then move on you are betraying her and ruining her future if she doesn't find out before marrying. What makes you think a scum can make her happy the rest of her life when he is already cheating?) If you are a cultivator you are strong and must have good reflexes, no need to act delicate and unable to defend itselves (how is it the mc can't avoid the advances of the guy? Why are his abilities and IQ -0 when he is around?).
And all the other major and minor examples of this mess that can only be explained by plot armor.
I feel bitter writting this review because once you get these two things out of the way, the story is interesting and a good read. If you can ignore this sting in you eyes you may continue and enjoy it.
On the other hand, the most bitter thing here are the comments of the people that are ok with the guy being a rapist and think it's valid in order to get the mc (even if it wasn't him, again, the mc didn't know). I just saw a few, but it felt so wrong to read those comments, especially the one with the meaning of "it's ok to be with a rapist, there are worst people out there". Just, be careful and don't believe everything you read.