This book tells the story of a young man named Si Zi who had special skills and was especially good at using a short knife. He rescued a young girl named Bai Xue who was molested by a traitor. They formed a deep love for each other. However, after the Japanese captured Yucheng, they killed the loyal and unyielding Bai Xue. The fourth son vowed to avenge Bai Xue, so he staged scenes of chasing the enemy. During the anti-Japanese struggle, he grew into an Eighth Route Army soldier and killed the enemy in the final battle of Yucheng.
