Lin Wantang, the fiancée of criminal investigation captain Shen Zhiyao, is the only living witness in the serial killer case, but she has forgotten everything due to traumatic amnesia. When the memory fragments began to recover, the password whispered in her dream actually pointed to Shen Zhiyao's old unsolved case three years ago. The excessive intervention of psychological consultant Zhou Yanqiu, the secret dealings of intelligence dealer Lu Zhao, and the disguised kindness of family member Chen Yanzhi make every clue full of poisonous sting. Shen Zhiyao must choose between chasing the murderer and protecting her, and Lin Wantang is slowly remembering that she is not a bystander, but an accomplice in the experiment that year.
