A mock trial in a certain university is debating a real case that happened not long ago. The suspect in the case is a rich second-generation adopted by a real estate developer, whose biological father is a migrant worker from Henan. On the night of the incident, someone heard a fierce quarrel between the rich second-generation and his biological father, who was then killed at home. The students debated fiercely about whether the suspect was guilty, and their father watched the entire court trial process as a jury. During the recess, 12 jurors were taken to another room for discussion. They had to come to a conclusion within an hour, and they needed to vote unanimously to decide whether the suspect was guilty. These people came from all walks of life and had different backgrounds. Everyone generally hoped to get things done as soon as possible, but after the first round of voting, only juror No. 8 (played by He Bing) believed that the suspect was not guilty. Some people were furious, some ridiculed and joked, some were wavering, and some were stubborn. This is a fierce battle about conscience and morality... This film is adapted from the classic film "12 Angry Men".