Xie Xiang joins the army in her brother's stead by pretending to be a man. She becomes classmates with the wealthy Gu Yanzhen and the calm Shen J
unshan. Through their rigorous training, the three form a bond to become comrades, while Xie Xiang tries to keep her secret. After many incidents, Xie Xiang earns the respect of her peers and superiors. She also becomes the object of affections of the two men in her lives. The Japanese military stations more forces in the Northeast region causing the young heroes to be engaged in battle as they uncover a big conspiracy.