I recommend a novel. The male protagonist is Hades, who was once an emperor in ancient times, and the female protagonist is a dragon princess who transmigrated.

Later on, there was a child, and the child had a divine beast, Qilin (the female protagonist seemed to be in the modern era at that time, or something). The male protagonist opened a teahouse in the modern era to wait for the female protagonist. Then, the female protagonist remembered because the ancient corpse restoration map looked exactly the same as the female protagonist, so she went to the ancient era with the male protagonist. It was as if the male lead was the ten-thousand-year-old Nether King, one of the few master gods. At this time, he had to go through the tribulation or something, so he couldn't be with the female lead.