The Japanese army raided Zhu Jianguo's village, killing his family and burning down his home, turning him from a farmer into an avenger. The brutal rule of the Japanese army (plundering resources and suppressing resistance) forced more people to join the anti-Japanese ranks and build base areas.
Zhu Jianguo joined the army for revenge. He was appreciated for his actual combat talent and joined a special forces team to fight the Japanese army to the death.