Chen Mo, a former criminal police officer from the crime team, was forced to sign a contract of prostitution with the underworld due to a bizarre car accident and "fake death". He became a yin and yang worker who reversed day and night - investigating murders in the yin world during the day and catching ghosts in the underworld at night. He held a police badge in his left hand and a soul-catching flashlight in his right hand, making money and career in the yin and yang gap!
The order of the underworld has collapsed, the circulation of underworld coins is abnormal, and the ancient monster is ready to move. Chen Mo takes Bai Qi, a forensic doctor who can understand ghosts and gods, Lin Xiaotou, the son of the richest man disguised as a police officer, and his chatty boss Black and White, from the murder case of an infant spirit in an abandoned hospital to the mysterious mines on the China-Myanmar border; from the leakage of yang energy caused by supernatural live broadcasts to the power game of the five ghost emperors, they solve mysterious cases, fight monsters, and ghost emperors all the way. While making a lot of money, they also reveal the ultimate secret of the tampering of the Yin and Yang worlds!
"I don't want to be in this bad class for a day!"
——But in order to buy a house in the Yang world and upgrade equipment for the underworld, Chen Mo decided to poke a hole in the sky of Yin and Yang first!
