Introduction: During the Anti-Japanese War, the Japanese invaders carried out a "sweeping" on the Jizhong Plain. Ye Cheng, a mathematics genius who returned from studying abroad, joined the tunnel construction in the village. Faced with puzzles and doubts, Ye Cheng used his mathematical knowledge to lead the villagers to upgrade. Perfect the tunnel, and skillfully resolve the Japanese attacks time and time again. The cunning Japanese generals used an isolation strategy to wipe out the tunnels surrounding Ye Cheng. Under the precarious situation, Ye Cheng took the initiative to attack, using the surrounding terrain to connect tunnels into a network to counter-encircle the Japanese army. Can they successfully destroy the enemy?