In a post-apocalyptic urban world overrun by mutant beasts, the weak can only become prey. Yu Jin was once the heir to the Yu family of Qin City, but a conspiracy led to his abandonment by his family, false accusations, and imprisonment in a frontier prison city with an extremely high mortality rate. On the brink of death, he awakens a mysterious system and discovers that hunting mutant beasts grants him lifespan and power. From a discarded nobody to an unparalleled martial artist who shakes the entire prison city, Yu Jin gradually uncovers the truth behind the destruction of his body and discovers an even greater conspiracy lurking behind everything he once lost. While his family believes he is certain to die, an abandoned man is forging his own legend from the bones of mutant beasts.