In Beiping in 1937, a storm was about to come. The coachman Zhao Si'er never thought that he would be involved in a secret battle related to the survival of the nation. He originally wanted to pull a cart to earn money and marry a wife, but due to an accident, he became a "hot potato" in the eyes of the military commander, the underground party, and the Japanese army. He doesn't understand the justice of his family and country, but he is the fastest runner in the alley and the best at hiding secrets. From a "tool man" who was exploited by all parties to a "hutong hero" who gradually awakened, Zhao Si'er measured the suffering and rebirth of Peiping with a pair of feet. When the smoke cleared, he realized: In troubled times, the bones of ordinary people can be stronger than city walls.
