Bizarre murders occurred one after another in Binhai City. The deceased had a strange smile on his face and no external injuries on his body. Only a bloody fingerprint was left at the scene. The detective Jiang Chen, who attaches great importance to love and justice, accidentally awakened his yin and yang eyes during the investigation and can see strange shadows that ordinary people cannot touch. He met Su Wan, a knowledgeable folklorist who was proficient in all kinds of supernatural legends and ancient records, and the two formed a partnership.
Behind each unsolved case, are evil spirits that have been dormant for many years at work, or is it an ulterior conspiracy? Jiang Chen relied on his yin and yang eyes to see through the fog, and Su Wan used the wisdom of ancient books to solve the dangerous situation. They wandered on the edge of life and death, uncovering the bloody secrets under the bustling city, but they didn't know that they had already been involved in a shocking mystery that spanned a century.
