I finally got around to reading that one last week. It's this intense Chinese web novel about a CEO, Mu Chen, and his wife, Su Wan, who's been secretly in love with him for years. The whole thing kicks off when she overhears him telling someone else he only married her for convenience and doesn't love her at all. That's the 'betrayal'—it's emotional, not some affair. The plot is basically her long, painful process of detaching and trying to leave, while he, in classic cold male lead fashion, only realizes what he's lost when she's truly gone and then has to chase her desperately.
It's packed with all the tropes: contract marriage, hidden illness (she gets cancer, of course), noble idiocy, and the eventual groveling redemption arc. The appeal is really in the emotional whiplash—you just want to see the male lead suffer for being so blind and cruel. The writing can be pretty melodramatic, but it absolutely delivers on that specific kind of angsty satisfaction if that's your thing. I powered through it in a weekend when I needed a good cry.