My Organs Can Fuse Monsters!

The world changed drastically and thousands of monsters appeared.Humans have the ability to fuse monsters in every organ!Monster quality: ten years, one hundred years, one thousand years, ten thousand years, one hundred thousand years... Lin Sen is a good-for-nothing. After graduating from high school, his family gave him a loan of a ten-year monster with all their wealth.【Head】: None[Torso]: None[Left arm]: None[Right arm]: Little yellow ape (ten years of quality)[Left leg]: None[right leg]: noComprehensive evaluation: E gradeFortunately, he awakened the [Monster Cultivation System], upgraded the possessed monster, and completely changed the monster's attributes:【Head】: None[Torso]: None[Left arm]: None[Right arm]: Monkey King (ten thousand years quality)[Left leg]: None[right leg]: no