The modern city overlaps with the secret realm of mountains and seas. Some humans have awakened their "beast-controlling" bloodline and can contract with strange beasts from the Classic of Mountains and Seas to form a "beast-controlling alliance" to divide forces. The protagonist Lin Ye's family is a beast-controlling family that has been passed down for thousands of years. However, because of guarding the secret treasure of the "Mountain and Sea Prison", the family was jointly exterminated by the allies. The prison lord's bloodline awakened by the protagonist can communicate with the mountain and sea prisons to suppress the ferocious beasts, and the "sin beasts" sealed by the contract. The sin beasts are extremely powerful, but they need to be fed by the protagonist's own evil energy, and for each contracted one, the protagonist needs to withstand the vicious backlash of the corresponding ferocious beast. The hypocritical leader of the Beast Taming Alliance Zhao Shanhe, the traitorous family affiliate Lin Xiao, and the overseas organization "Beast Hunting Group" who covets the secret treasure.
