MTL - The Sword Named No Way Out - Chapter 75

Warden wakes up in a wilderness with a hole in his mind, deprived of all his memories. Lost, he found within himself an aptitude for combat and magic.On happenstance, he rescues a pair of youths and an entire village, pushing him into a renowned academy of mages and warriors alike to become a teacher.Warden adventures across the divided land of Ezim, determined to unravel the mysteries of his past. However, the task becomes incredibly hazardous when his own path—the ruinous power of Void that runs through his veins—holds a connection to the Traitor Gods, who threaten to cast their shadow upon the world once more.

Collection of short stories.

- Description from Novelupdates

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…

Upon meeting the girl who would become her adopted younger sister, the duke’s daughter Christina regained memories of her previous life. Through those memories, she learned that her new sister, Mishuli, was the heroine of a certain story. And though the story depicted a Christina who abused her sister, the real Christina turned into a siscon who spoiled Mishuli to no end.