It’s very different. In the novel, there are multiples plots. More drama (too much).
It would be too long to explain all but GuYangChen really made amend and had a hard time before NianNian trust him again and open his heart to him. They reconcile and married again. NianNian is very happy and cured of all his past trauma. GuYangShen really changed and is totally devoted to NianNian and love him sincerely and wholheartedly.
I’m sorry I can’t remember what chapter, there were too many differences between the novel and the manga. For example, the necklace. In the manga it is treated like something minor though in the novel it is avery major item, very important for NianNian.
I think the manga starts to be different from the novel after GuYangshen discovers that ShenLuoan is a liar about being the one saving him and discovering NianNian is his real savior. I’m not sure...
This is so frustrating ! I read the novel and it is far way better than this !
SPOILER
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In the novel, you can face lot of drama (maybe too much) but you can see a real redemption about GuYangshen and it takes a certain time before Nian Nian accept him again. And reading the novel even if you know GuYangshen past behaviour, little by little you agree about the two getting together again.
But for the manga there are too much differences with the novel and that really disturb me. For example, in the novel Qin Qibai is not so horrid he’s just a big a jerk. The real great villain is ShenLuoan who lured GuYangshen and continuisly hurt NianNian juste because he was jealous and greedy.