Villainous Demon Son-In-Law summary:

Ordinary student Yayoi, because a thousand years ago, he was kind to Xiangliu, he had a marriage affair with the daughter of Xiangliu family. Reluctantly, the Xiangliu family had to let him enter the demon den and become a son-in-law. From then on, the group of demons often accompanied him. At the pinnacle of life, he was even involved in the “longevity” storm. Everyone wanted to live forever. Everyone wanted to ascend. The biggest secret was hidden in him as a mortal. Relying on the soaring secret, Yayoi stepped on the demon clan and leaned on the town demon division with her back, and became a big villain who demon cried out.