Transmigrating to 1937: Playing the Fool at Bureau 76

I'm Lu Zheng, a hothead who curses at the world online every day. After dying suddenly, I transmigrate into the body of a traitorous interpreter in 1937 Shanghai. To stay alive, I pretend to be greedy, cowardly, and useless, bouncing back and forth among the Japanese, the military intelligence service, the underground Communist Party, and 76. They say I'm a scrap of wire, something anyone can step on. But they don't know that the whole trench depends on my barbed wire to keep the enemy out. I'm no hero. I'm just a useless guy with incredible luck. Back then, my greatest skill was making everyone think I was useless. My biggest regret was not keeping them all convinced.