The unlucky detective Shen Yi'an accidentally stepped on the peel of a banana while chasing the murderer and died. He actually dressed up as a sickly young man from Shanghai during the Anti-Japanese War. I thought I could just lie down and be a salted fish, but the underground party on the verge of death handed me a piece of top-secret information! Send information? He doesn't even know where the party organization door opens! What's even more deceptive is that the agents who are chasing him come right after smelling his scent. Let's see how he relies on a "dog-nosed" golden finger and a belly full of criminal investigation tricks to escape for his life while looking for organizations in troubled times, using his tricks to stir up a shocking mystery!