Terminal Illness? Sorry, My Cancer Is the Strongest Cheat

Suffering from a terminal illness, he went to the North Pole to see his beloved with the intention of dying, but he was hit by a glacier collapse and fell into a rift valley! After accidentally eating the meat of a frozen prehistoric beast, prehistoric archaea invaded wildly - the immune system, cancer cells, and archaea that are hundreds of millions of years old were fighting, and a strange symbiosis was born! A terminal illness makes him immortal, and he has super powers to explode and cheat! The worse the cancer, the stronger I become.