In the early 1970s, the Kunlun Military Region came to school to recruit soldiers. Four good friends, Yuan Ying, Ding Haotian, Lü Qiang, and Fang Yang all signed up.
Yuan Ying's parents, Yuan Yousheng and Cuilian, opposed Yuan Ying joining the army. Dissatisfied, Yuan Ying hitched a ride to catch up with the troops and found Wei Tiefu.
Wei Tiefu and Yuan Yousheng were once partners in a certain border defense company. In a battle to eliminate rebellious traitors who crossed the border, Yuan Yousheng was wounded while covering for Wei Tiefu and lost his ability to have children, so Wei Tiefu gave his newly born daughter to Yuan Yousheng, who had returned home after being discharged from military service, promising never to see his daughter again.
Eighteen years later, Wei Tiefu became the commander of the Kunlun Military Region, his wife Gui Hongyun became the director of a hospital department, and their daughter Wei Jie also worked as a nurse in the hospital. The sudden arrival of Yuan Ying both surprised and delighted Wei Tiefu, but he dared not keep Yuan Ying. He assured Yuan Yousheng that he would keep his promise from those years ago. Wei Tiefu concealed from Gui Hongyun the truth that Yuan Ying was their daughter, while Gui Hongyun had been secretly searching for her daughter without letting Wei Tiefu know.