In 1936, Huang Weijie, a member of a patriotic organization, was tasked with getting rid of Chairman Ma, who assisted the Japanese black businessman in smuggling opium. He happened to meet Feng Guanyu, a patriotic businessman, who turned out to be his childhood friend. After many years of separation, they met again, but they were on edge because Feng Guanyu broke his promise when he was young, which led to Huang Weijie being almost beaten to death by Japanese ronin. Feng Guanyu wanted to repair his friendship and make up for his heart knot because of his debt. Under Feng Guanyu's strong hand, Huang Weijie was forced to become his bodyguard. Although the two had constant conflicts, they regained their brotherhood in the common hardships. With the emergence of Japan's invasion of China, the two people with justice ideals joined hands to fight and bravely devoted themselves to the cause of patriotism. Although the night has come, the dawn and the light are also ahead.