(Patriotic literature + Anti-Japanese War espionage + lurking + multiple identities + cooperative marriage + dual strength) In 1940, Su Man came to Shanghai, a crisis-ridden city after the fall of Japan, and lurked into Demon Cave No. 76, Codenamed "Peony". I wanted to rely on the espionage skills I learned at the Moscow Secret Service Academy to fight against the Japanese invaders, but I was betrayed by a traitor, and our party's underground network was severely hit. The organization sends a mission to protect the "old gun" that has been lurking in No. 76 For many years at all costs. In order to protect her comrades from being exposed, Su Man is determined to use her skilled marksmanship, tactful ability to adapt to the situation, and fearless spirit of sacrifice to set off a bloody storm among Shanghai No. 76, The concessions of various countries, and the Japanese military police...