In 1935, Xiang Ziqian, Hu Xiaochun, Li Juzhen, and Fang Yunxia were all students of Qilu University. Although they had different political beliefs, they all actively participated in the anti-Japanese and national salvation movement. After the Marco Polo Bridge Incident, Xiang Ziqian went to the front line, and Hu Xiaochun followed the school south. Juzhen and Yunxia went to Yan'an together... Ten years later, in Jinan in 1947, the four met again. Ziqian was already an officer in the national army and married Yunxia. Xiaochun returned to Jinan with Qida and stayed at the school to teach. Juzhen was a middle school teacher.
At the gate of Qi University, a murder case reunited four people who had completely lost contact, and the appearance of a man named Qi Lumin caused a huge storm.