I recommend Lan Lan's new article," Pet Cutie Concubine: Shifter Emperor, Don't Do Anything!" In the middle of the serial. The main character, Yama, was the illegitimate son of the Heavenly Emperor. He was sent to the Underworld and became the ruler there. He was known as the Demon Emperor. In order to break the Curse of Death on him, he married a woman with eight characters of pure Yin. I hope you like my recommendation.😗