Espionage: I Strengthened My Kidneys from the Start and Swept Through Shanghai

After the real estate market collapsed, construction engineer Gu Changan was forced to become a food delivery rider. But on a rainy night, he stumbled into a stroke of fortune and transmigrated to Shanghai in 1936, becoming a Chinese constable in the French Concession. When he woke up, he was lying beside the beautiful young Third Concubine of a powerful tycoon. The original owner had died suddenly after cheating and indulging himself. The tycoon could walk in at any moment, and people in the police station were already trying to kill him. Fortunately, Gu Changan awakened the Everything Enhancement Trait System. Once a day, he received an enhancement opportunity. Three random traits appeared, and he could choose one to take effect permanently! Tenfold kidneys, tenfold cardiovascular system, tenfold bones, tenfold muscles, tenfold reflexes... Enhance himself and forge a nearly immortal body. Enhance a firearm and blow an armored car to pieces with one shot. Enhance a car until it can take a heavy machine gun head-on. Enhance a combat vehicle and become an iron phantom that strikes fear into the Japanese army. Enhance a joint warehouse and turn it into an impregnable fortress of war! Others who transmigrated to the Republican era only thought about staying alive. Gu Changan wanted money, power, and beautiful women, and above all, the lives of the Japanese! As chief Chinese detective, he navigated Shanghai's underworld, appearing greedy and lustful while secretly killing without mercy. If collaborators dared reach out, he'd chop off their hands. If Japanese invaders dared provoke him, he'd wipe out their families. Now that he'd arrived in this turbulent era, he would use the gun in his hand and his daily refreshed enhancement traits to forge a life unlike any other!