In the spring of 1949, in order to crack the assassination team of the Bureau of Secrets and win the uprising of a certain Kuomintang corps, the special case team of the Songjiang Public Security Bureau used Su Wenqian, a sniper master hidden in the civilian population, as an advisor to fight against Chi Tiecheng, the number one killer sent by the Bureau of Secrets. Su Wenqian was a killer who had partnered with Chi Tiecheng for many years. In the test of life and death with the members of the special case team, Su Wenqian, who had vowed not to take up a gun again, truly realized that the Communist Party is the hope and future of China. He sincerely stood on the side of the people and found the reason for holding a gun again. He was determined to defeat the assassination plot at all costs. The two first-class sniper masters therefore launched a series of wits and courageous, thrilling sniper duels. And this seemingly unrelated contest of assassination and anti-assassination is related to the life and death of the 100,000 troops in front.