Yin Hui, a modern homebody, transmigrates to a girls' military academy in Republican-era China.
The academy's main purpose is to train female spies.
Not only is Yin Hui the only male student at the entire school, he's also the only person in the world who can turn invisible!
After he gets "bored" with life at the academy, he resolutely heads for the bustling metropolis of Shanghai.
Thanks to his invisibility and his "outstanding" abilities, he takes on multiple identities as a spy for the Chinese Communist Party, the Central Bureau of Investigation and Statistics, the Military Statistics Bureau, the Japanese puppet regime, the Green and Red Gangs, and more...
In the end, the organization recognizes him as an Invisible Guardian whose contributions are beyond measure!
