1941, Shanghai. The Japanese and puppet secret service "Mei Agency" and the Wang puppet No. 76 Agent headquarters have woven into a tight surveillance network. In this city that seems prosperous but is actually suffocating, Su Mingzhe, a senior underground worker codenamed "Tailor", lurks as an employee of a foreign bank, passing on information and contacting comrades with precision like stitch. When the Japanese military's top-secret plan "Sakura Fall", which was about to launch a new round of military operations, was quietly brewing in Shanghai, Su Mingzhe found that his peaceful pretend life was broken by an unexpected murder - the contact person died in an alley just two streets away from his apartment, with a matchbox with his pseudonym written on it stuffed in his pocket.
