Lin Xiaoman is a doctoral student in the Department of Modern Chemistry. After accidentally coming into contact with the mysterious herb "Night Shadow Grass", he was sucked into another time and space, and his soul transformed into Lin Wan, a lowly and discriminated female widow in Daqi Dynasty. In that world filled with evil spirits and rampant demons, she relied on scientific thinking and careful observation to uncover a series of murderous conspiracies that were covered up by the supernatural.
From "Ghost fire burning house" to "shadow marriage claiming life", Lin Wan used modern medicine time and time again to expose the lies of the underworld. She was regarded as an alien by the cold-faced headman Gu Changge, and was also called "the ghost doctor's little lady" by the people. However, as the case deepens, she discovers that her time travel was no accident: in her previous life, she was driven to pieces because she failed to solve the problem. She returned in this life with the mission of repairing the "fate loophole."
Faced with the temptation of Shen Xuan, the envoy from the underworld, the conspiracy of the mysterious organization "Xuanling Sect", and the indistinguishable relationship between humans and ghosts, Lin Wan investigates the case and saves herself. At the same time, beside the cold and gentle Gu Changge, Lin Wan redefines: In this world, it is not that there are too many ghosts and monsters, but that there are too many people's hearts. What she wants to do is to use her wisdom to expose all absurd "drama".
