The Agent Army of the Resistance War

Traveling through the Republic of China, Lin Zetian came to the most humiliating era in history. With the help of the system, he became a super agent. His choices made him at the top of the food chain. Because of him, Japan's super high school became his harem. Because of him, the whole world trembles. This is my first time writing a novel, so please bear with me if there are any shortcomings. Single female protagonist???ω??? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.