I! the Number One Stupid Traitor Is Actually Lurking Under the Ceiling

[Anti-war espionage + pretending to be a pig and eating a tiger + misunderstanding flow + double-sided undercover + deep sea lurking + cruelty-free master + long story] The whole city reviled Cao Liwen as a greedy, stupid, traitor, and the Japanese military commanders scrambled to promote him! Everyone laughed at him for living his life without thinking, but little did they know that he had been pretending to be stupid and lurking for decades, traveling across the river city to an isolated island, and he was a top-notch deep-sea undercover agent with zero flaws.