Espionage: I Just Transmigrated, and the System Says I’m the King of Spies

[Entirely hand-written, no AI]+ [Feel-good story]+ [No saintly protagonist]+ [Fast-paced plot]+ [Sound logic] A pure spy-action power fantasy! Wang Lin has just transmigrated to the Republic of China era during the War of Resistance when he inexplicably gets bound to an Ace Agent System! He assumes it will help him gradually become an ace agent. But according to the System, he's already one, and is simply making a comeback! What is going on? Didn't I just transmigrate? I'm already the world's greatest agent? Well, what are we waiting for? Let's give those damn Japanese devils everything we've got!