I, Rugset, Cosmic Janitor

[Colorful Dragon Rugset, myriad worlds, invincible protagonist, no System, no female lead]

He transmigrates and becomes a white blood cell of the universe.

Sait raises his golden eyes and immediately spots that azure planet, Blue Star, riddled with disease.

"As a white blood cell, my main job is to devour viruses and clear out foreign bodies."

"Isn't that right, Space Beasts?"