Probably everyone who has been in the underworld for a long time accidentally traveled into the book "Dream of Red Mansions" (it may also be a world where Red Mansions is a mixture of a bunch of other dramas)
Source of imagination: Ying Zheng = born in the first month ≈ Jia Yuanchun (???)
Cp is Tianzheng and good faith. There are feudal colleagues like Li Si→Zheng, Bang→Xin, and Bang Hezheng.
The time-travelers who have appeared so far are: Ying and Liu who do not want to be named
Black feed the dog!
Concept: historical figures