Your name is Xiao Tu. Two years ago, you were an impassioned patriotic student in Shanghai. You were running on the streets and calling for "Anti-Japanese and National Salvation", that got you arrested and imprisoned. After your release, the teacher arranged for you to study in Japan. Two years later, your image as a patriotic student has long been forgotten by people. The teacher and the organization decided to let you break into the enemy. How can you play this "Mission Impossible" wisely? Faced with difficult choices, do you care about the overall situation or be soft-hearted?

Go back to the turbulent era of wars, become an invisible guardian, and experience the spy life at every step. Every choice you make will affect the direction of the ending.