Prison System

This is a story in which the protagonist, Feng Yan, a boy from Earth with a mysterious bloodline, inadvertently relies on a system called the Prison System to travel through thousands of worlds. With the ability to travel through the world, as Feng Yan's strength improved, more and more secrets were discovered. For the survival of mankind, Feng Yan embarked on the path of being the strongest in the universe. Kill monsters, level up, and Feng Yan's story officially unfolds. Ps: A novel about cultivating immortals and upgrading.