Sun Yichen was wrongfully imprisoned after his secretary was accidentally killed during a business trip. In prison, he not only contends with the prison bully Sito but also faces bullying from the ruthless prison warden. His only solace comes from the prison guard Hu Hai. Already an excruciating experience, life in prison becomes more unbearable when a deadly infectious disease breaks out. Faced with this disaster, Sun Yichen decides to use his knowledge to change his fate and seek justice for himself.