My Iyashikei Game - Chapter 9

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

To save a doomed fantasy world, I killed the main characters, then destroyed the game world, and fell into another timeline as the academy's top seat and rival to the protagonist.Now, I'm trying to save the world and steer it towards a better ending…But I'm the final boss.

A young man from the Miaowei Tribe brought up by his strict father, suddenly turned into Wizard I on the day he was orphaned. He then obtained the ability to control giant worms.

I am Ye Qing. Lucky I found a [Monster Factory] application.