A spy is shot dead at the border of North China. Investigator believe that there must be another spy crossing the border elsewhere at the same time.

This movie is adapted from the novel Heroes in Tongbai. Xiao Hua, a sister of Zhao Yongsheng, is deserted by her poor family. He Xiangdong, a woodworker, adopts her and rename her He Cuigu. To steer clear of arrest by the enemy, Dong Hongguo, offspring of a revolutionary family, is renamed Xiao Hua so as to be adopted by her adopter. Later, Zhao Yongsheng's parents are killed by the enemy, he join...

A recruit grows up quickly in the army and becomes a mature soldier.

Song of mango