Seventeen-year-old boy Chen Yan witnessed his parents being tortured and murdered by loan sharks. The law was powerless and the system failed. In desperation, he followed his uncle who was living in the dark side to learn the survival rules of the dark side. From collecting debts on the street to establishing an underground consulting company, Chen Yan gradually discovered on the road of revenge: the real devil wears a suit and manipulates the law. He must learn to walk between the cracks - using dark means to pursue justice and establish his own order on the ruins of the rules, but in the process he constantly questions: Will the dragon slayer become a new evil dragon?
