Shen Zhiwei was forced to marry into the underworld and entered into a life-and-death marriage contract with Zhou Wujiu, the remnant soul of the Underworld. Bai Shuang's secret paper letter and Ah Tang's strange dream revealed the truth about her mother's sacrifice. And Huo Jin, the director of the funeral home, is using countless orphans as bait to restart the blood wedding array that happened a hundred years ago. When Xie Jiuniang, the evil spirit in a popular wedding dress, tears apart the boundaries between yin and yang, Shen Zhiwei finally understands: she is not a sacrifice, but a key. Zhou Wujiu's soul is about to disappear, and Ah Tang is replacing her fate step by step...
Shen Zhiwei was forced to hold a ghost marriage on the anniversary of her mother's death, and concluded a yin-yang contract with Zhou Wujiu. From then on, she was pulled into the fantasy of shady marriage every night by the resentful spirits. Bai Shuang uses paper figures to pass on her mother's relics - a copper lock engraved with "Exchange Life", implying that Shen's mother died for someone else. Ah Tang suddenly appears and can unconsciously absorb the obsession of the deceased, which arouses Xie Jiuniang's covetousness. Huo Jin secretly cultivated new sacrifices in the name of 'adopting orphans', intending to replace Shen Zhiwei with Ah Tang to complete the ultimate ritual. In order to protect Shen Zhiwei, Zhou Wu Jiu forcibly tore the seal, and his soul was on the verge of disintegration, but when he was about to die, he remembered: he and Shen's mother were lovers, and Huo Jin was the mastermind back then. In order to save Zhou Wujiu, Shen Zhiwei took the initiative to step into Xie Jiuniang's blood marriage formation, using herself as a guide to awaken the souls of the twelve brides who were suppressed a hundred years ago. Ah Tang chose to sacrifice himself at the last moment, activating the Yang Shu body and reversing Yin and Yang, but he also disappeared as a result. Shen Zhiwei used blood as a curse to fuse Zhou Wujiu's remnant soul with Atang's spiritual consciousness, seal Huo Jin, and recast the law of underworld marriage. And when the first ray of morning light fell, a wisp of paper kite landed lightly on her palm - Bai Shuang's soul was finally freed.
