Ankoku Kishi Monogatari ~Yuusha wo Taosu Tameni Maou ni Shoukansaremashita~ - Chapter 41.5: Minstrel

Xiao Shan is a famously profligate prince, the kind that makes his emperor father angry just by being seen. Xiao Shan’s greatest wish in life is to be a salted fish who lives without any worldly strife, until his father bestows upon him Xie Zhui, a ger who has been mixing with men, to be his bride. Xie Zhui took his brother’s place in the army at fourteen, achieved great merits by successfully defending against enemies outside the northern border city at sixteen, and was discovered to be a ger after being seriously injured at eighteen. After returning to the capital, the emperor pardoned Xie Zhui’s crime of deceiving the monarch and bestowed him to Xiao Shan as his rightful spouse. Everyone says that Xiao Shan has married a ger who came out of a pile of men, with a vast grassland above his head. They think about how much the emperor must dislike Xiao Shan to have given him such a troublesome marriage.

Calamity descends upon a a tranquil world in the black of night, transforming it into a death game! This a a true apocalypse, but this is not the end of humanity!

- Description from Novelupdates

Three years into Qin Yu's marriage, his wife and in-laws all hated him.

When Kim Seojin opened his eyes, he found himself three hundred years in the future.In the last three hundred years, humanity went through a lot of changes. Science had developed, cities became more modern, and space travel became a reality. But all of that came at a cost.The world had become a plaything of gods. Every year, humans were selected to represent their race in a devilish game, all for the entertainment of the gods.Kim Seojin was one of the thousand people selected in a timeline where he didn't belong.There was one more person. A Regressor burdened with the memories of countless failed timelines and the knowledge of the destruction to come, was also a part of the game…