What was the main content of the fourth volume of Qin Shimeng?
"The Legend of Qin: The Sword and the Heart of the Zither" was released in the mainland of China on July 16, 2019. It was the fourth movie in the "The Legend of Qin" series. The movie was set after the fall of the Qin Dynasty and told the story of an emperor named Ying Zheng (played by actor Zhao Lixin) who was facing internal and external threats while holding the power of the army. The story mainly revolved around Ying Zheng and his two queens, Fu Su (played by Liu Haoran) and Lu Buwei (played by Chen Baoguo). At the same time, a group of swordsmen named "Mo Family" also fought for Ying Zheng's safety. The movie told the story of Mo Mei, the leader of the Mohist family (played by actress Ning Jing). After Ying Zheng ascended the throne, she started a life-and-death struggle with Ying Zheng in order to protect the Mohist family and the people. In the end, Ying Zheng was convinced by Mo Mei and decided to give up his power and protect the people together with the Mo Family. The movie also showed the swordsmanship skills and battle scenes of the Mo family swordsmen, allowing the audience to feel the powerful power of the Mo family.