Kill kou, kill Lu zizheng. Zhao Jing and Lao Ling are both dead. "Killing Kou" mainly tells the story that six classmates and friends headed by high flyers Lu Zizheng of Nankai University formed an anti-Japanese group "Killing Kou" to defend Tianjin, and Lu Zizheng, Lao Ling were finally killed by the Japanese army.