盛夏时节，鬼子的一辆军车在山区的树林里遭到我八路军一个连的伏击。一阵密集的子弹过后，一名侥幸的鬼子夺路而逃，但没跑出多远，就被布在草丛中的一个绳扣倒着吊上了树梢。绳扣是一个年龄在十五、六岁的孩子布下的。捡起鬼子的枪，男孩子满以为就是自己的了，可八路军战士也缺枪，不少参军时..

Shanzi 's father is an experienced hunter. Under his father's influence, Shanzi became a skilled marksman. The Japanese came, massacred his village, and brutally killed his family, the sixteen year old boy became an orphan. One day, a Japanese broke into the trap set by him. He snatched the enemy's gun but was blocked by Eighth Route Army soldiers. After some twists and turns, he joined the Eighth Route Army.

He thought that if he joined the army, he would be able to fight Japanese invaders and avenge his parents, but the army commander disarmed him and sent him to the cooking class to follow Lao Jiaodong. One day, the squad was tasked to cover a large force. However, this was a very dangerous mission. The sudden invasion of the Japanese plunged the squad into a bitter battle. They were forced in a desperate situation, at the moment of life and death, Lao Jiaodong sacrificed his life to save Shanzi. From then on, he became a lone hunter trying to take on the Japanese by himself.