On the eve of the liberation of Shanghai in 1949.The dark rule of the Kuomintang is about to end, and the dawn has not yet come.Lin Shaobai, a former police officer in the Shanghai Police Department, is looking for various ways to stock up on rice, noodles, vegetables and other daily necessities.He is just a little policeman. No matter who takes over the city, he has to maintain the lives of his two mothers - his dead father's first wife and his biological mother.

It was salary day. On his way to work, Lin Shaobai saw that the whole street was filled with the chaos of Shanghai.My salary was owed for more than half a year, but what I was given was gold yuan coupons that were like waste paper.Lin Shaobai was so angry that he took his partner Xu Wei and sneaked into the police station's warehouse and made away with a lot of good goods, preparing to resell them on the black market.In the evening, Lin Shaobai and Xu Wei came to pick up the goods. They happened to catch up with the division chief Ye Shiwu, who was ordered by Director Mao Sen to secretly massacre the underground party before the city of Shanghai was broken.

The underground party members regarded death as home and sang the Internationale.This scene deeply touched Lin Shaobai who was peeping.Lin Shaobai and Xu Wei were about to leave secretly, but Ye Shiwu blocked them and forced them to shoot underground party members.Since Lin Shaobai and Xu Wei saw them massacring the Communists, they would have blood on their hands together.

At the critical moment, Lin Shaobai shouted to see Director Mao Sen, pretending that he could stay in Shanghai as a latent agent, but for the sake of innocence, their hands must not be stained with blood.Just when Mao Sen agreed, Xu Wei's gun rang out downstairs, and he fired twice, killing the remaining two Communists for Lin Shaobai.