Hidden Evil

The story takes place in Shanghai in the 25th year of the Republic of China. Yu Gensheng and Lu Aili, a young man and woman who eloped from Sichuan, came to Shanghai to undergo abortion operations at Hongkou Women's Hospital. Doctors Zhang Wenhua and Chen Xiaobao made surgical errors, causing Lu Aili to suffer from massive bleeding and her life was in danger. Yu Gensheng negotiated with him and refused to give up. In a rage, Zhang Wenhua tricked Yu Gensheng into donating blood, thinking that the woman's blood transfusion could save her life, and then killed her and buried her body under the floor of the hospital's consulting room. Because the corpse was rotting and smelly, Zhang and Chen fled. After extensive searches, the police finally arrested the two men. Outside of this main line, there are complicated relationships between characters. Lu Aili and Yu Gensheng were originally high school sweethearts. While Yu was studying abroad, Lu married Yu's father and became his stepmother. Yu Gensheng, who knew the news, decided to elope with him after returning to China; Zhang Wenhua and Chen Xiaobao are black doctors. They are lovers and have a tense relationship with his wife Zhang Yao. Just before the operation on Lu Aili, Zhang Wenhua and Zhang Yao had a fierce conflict. Zhang could not calm down and made a mistake in the operation, which led to the murder. Did Zhang Yao do it unintentionally or did it intentionally? What role did she play in the entire case? Besides the murderer, is there an invisible murderer?