I Beat the Devil with My Fists

From the day Xu Yu turned twenty, he realized that everything in the world had changed. A strange marriage document. Betrothed Male: Xu Yu, human race, born on the eighth day of May, 2001 AD. Woman: Qingqiu Bai tide, born on September 29, 1988 BC. The marriage between two clans, a contract made together, and a good relationship will last forever... The Chenlong tattoo on his body, his grandfather who is blind in one eye, a group of people and monsters who want to take his life...