Delivery boy Yang Xue accidentally activates the "evil recovery system" while delivering food on a rainy night. It can recover evil carriers such as weapons, stolen money, and black accounts and convert them into "dark energy" to improve physical fitness, intelligence or exchange skills. In order to track down the truth that his childhood mother was forced to die by the powerful, he started from the edge of low-level crimes, and gradually got involved in urban dark webs such as underground gambling stalls, demolition shady stories, and scandals of powerful people. He continued to become stronger while recycling crimes, and finally confronted the "Night Owl Club" who controlled the dark order of the city, uncovering the shocking secret of the origin of the system and his mother's death, and using "dark energy" as a blade to split the darkness shrouding the city. The strong points of enjoyment focus on the real-time feedback of "recycling evil and becoming stronger", the high-energy reversal of outsmarting villains, and the burst of excitement of bottom-level counterattacks.
