MTL - Maze Survival: Only I Can See Hints - Chapter 74 New skeleton monster, Timberwolves surrender

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Due to a bug in the game, Ren Changsheng accidentally left the game idle for ten million years.As he watched the endless stream of experience points, all Ren Changsheng could think was, 'I really do not want to level up!'

Oosuki Masato is an ordinary high school boy who is magically transported to an alternative world, but for some reason his doting, over-protective mother comes along as well.