A Chinese couple studying abroad were inexplicably involved in a complicated murder case one day. The deceased was the ex-girlfriend of the male protagonist, Ye Nanfeng. Ye Nanfeng became the primary suspect. His current girlfriend, Gu Qingyu, began to investigate the case privately in order to clear her boyfriend of suspicion. Every time he was close to the truth, important witnesses always died mysteriously. Gu Qingyu expected that there was a powerful behind-the-scenes mastermind behind the case. From this moment on, the characters in the story began to fight to the death, and a shocking secret gradually emerged...