The movie "Keep Silent" tells the story of the famous singer Wan Wenfang being assassinated in a closed dressing room. Only Jimmy Thomas (played by Sun Rui) was present at the time. Lawyer Duan Mulan (played by Zhou Xun) was Jimmy's defense lawyer and was ready to defend him. Therefore, she had a fierce debate with the prosecutor Wu Zhengwei (played by Wu Zhenyu) in court, and the truth was revealed layer by layer. At this time, an insider said that the suspect Jimmy Thomas was the illegitimate son that Wan Wenfang had abandoned. This revelation also turned the nature of the case into a major "matricide" case. With the intervention of the key witness in the case, Wan Wenfang's producer Tian Jingcheng (played by Zu Feng), the truth became more and more confusing.