If you're looking for fluff romance, this isn't it. The premise/plot of the story is bound to be dark. The characters have a lot of baggage, their relationship, although consensual (through a contract), is toxic, abusive and manipulative (at least on the earlier part of the story)
The abuse is downplayed, saving us the details which probably made it tolerable to read.
I haven't completed this yet, but I... as a reader is completely brainwashed. I tend to get swayed by tortured souls and Jiang Yu and Cheng Suran are both. So I symphatize and root for them to be each other's salvation.
And at some part, you can almost feel the conflict of emotions and the heart break (made me cry 😭)
Especially on chapter
Spoiler
68-70 and that scene where Jiang Yu impulsively destroyed Cheng Suran's gift but in the end she tried hard to uselessly fix it, it reveals how important Cheng Suran is to her but she couldn't admit it to herself, that scene just hurts the heart (imo).
To sum it up, it's so bad it's heart wrenchingly good.
_____
Edit: I'm done reading!!! I stand by my rating, though I think the wife-chasing was too meh. Cheng Suran could've made Jiang Yu suffer more but maybe I'm just evil.