The plan to save the king of Yunmeng

I read a book once in a while, and it was full of regrets. How could I let go of such an opportunity to change it... Jiang Wanyin, here I come~ I will save those who can be saved, and those who cannot be saved, I will think of a way to save them. If it really doesn't work, then... don't blame me. It's just that, why are some people different from what I remember? Looking at Lan Xichen in front of him, Jiang Cheng just felt incredible... Isn't he a naive person? Who is this black-bellied man? (The original official pairing is not revealed, the CP is Jiang Cheng and Lan Xichen, and other characters have changed)...