Rookie lawyer Cheng Buyi (played by Chen Buyi) has just entered the workplace. Fortunately, he meets a considerate and outstanding beautiful boss (played by Tan Li). But one day, Qianxun was killed in the law firm, and new evidence and information about a case she had been tracking for many years were left at the scene. After investigation, Chihiro's sister, trainee psychic Shi Zhenxiao (Mirui Kiritani) was arrested as a suspect. Cheng Butang firmly believed that Zhenxiao must have been wronged, so he appeared in court to defend him. In court, he met his childhood friend Reishi Mitsurugi (played by Saito Takumi), a calm and meticulous "genius prosecutor". The two exchanged evidence and testimonies and engaged in a fierce war of words. But shortly after the case ended, Yu Jian was arrested on suspicion of murder. The person who prosecuted him was Yu Jian's teacher, known as the perfect prosecutor (Shi Qiaoling) who has never lost in 40 years. When his friends were in trouble, Cheng Butang volunteered to act as a defense lawyer and launched a powerful confrontation with the overwhelming hunters. Liu Shi's father, Yu Jianxin (Ping Yueda), was a lawyer during his lifetime. Shot to death in court evidence warehouse 15 years ago. The case, known as the "DL6 Incident," remains unsolved. In the arduous defense battle between Chengbutang and the demon hunters, the long-lost "DL6 Incident" and the truth behind it gradually emerged.