In the ancient dynasty of the underworld, {Su Wan} claims to be a witch. During the day, she is a quiet record-keeper, and at night, she transforms into an eccentric detective. Between her multi-faceted personalities, she hides unknown secrets. She originally wanted to live her life in the underworld, but due to a bizarre case caused by "dark cuisine", she was forced to be involved in the storm.
Lu Yan, who is sunny and hot-blooded but has hidden crazy attributes, suddenly appears. He is strategizing and has a strong possessiveness towards Su Wan. The two have repeatedly clashed during the investigation. As the investigation deepens, hypocritical colleagues, jealous old acquaintances, and darkened old friends appear one after another. There are also dangers of mysterious system upgrades and investigative props going out of control. Su Wan had to break the normal routine and use the wisdom of a witch to uncover the layers of mystery in the underworld, only to discover that the case behind the case was closely connected to her own past.
