In the twenty-eighth year of the Republic of China, Nanjing fell and became a hell on earth under the rule of the Japanese and puppets. Su Wan, the owner of the cheongsam shop "Wanxiang Pavilion", appears to be a gentle and charming businessman, but in fact he is a liaison officer of the underground party of the Chinese Communist Party. He uses the secret code of the cheongsam buckle to convey important information about the anti-Japanese war situation. Shen Yanzhi, secretary of the Wang Puppet Government, has a refined manner and a mysterious identity, and is regarded as an enemy by Su Wan. The two intersected due to an unexpected intelligence exchange. From testing each other, becoming suspicious and wary, they gradually discovered each other's true identity and patriotism through life and death tests. Facing the dragnet laid by Kenichi Matsui, the director of Japan's Special High School, they put aside their barriers, used cheongsam as matchmaker, and wisdom as blade. They worked hand in hand in a secret battle of swords and swords, vowing to smash the Japanese army's intelligence network and ignite a glimmer of hope for their country.
