Synopsis: The fourth corpse corroded to the bone by solvent was found near the Hanjiang River. The only way to identify it is to rely on the sage (Shen Xianjun) of the Scientific Search Institute to rebuild its face. Xian Min wants to quit her job in order to take care of her daughter who is about to undergo heart-changing surgery. At this time, Sun Ying (Song Yunyi) from the Anthropology Research Department came to you with a newly discovered skull, forcing the sages to start facial reconstruction, but a series of terrible nightmares began. At the same time, the police officer in charge of investigating the serial killings found that all the victims were extremely rare allergies, so it was suspected that this had a lot to do with heart transplantation. Xianmin worried about the source of her daughter's heart, and completed the reconstruction of the fourth skull with Sun Ying, but the terrible nightmare did not end, but found an amazing fact.