In order to save her seriously ill family, Su Xiaosu was forced to sign a symbiotic marriage contract with the "Lord of the Underworld" in the ancient tomb who had been sleeping for thousands of years. She needs to regularly enter various evil tombs to absorb Yin Qi to keep the Lord of the Underworld alive, while the Lord of the Underworld provides protection when she robs tombs. The relationship between the two heats up during mutual hostility and mutual help.
