The wind on the border blew through countless days and nights of persistence. Lu Zheng is the "sharp blade" in the special forces who makes enemies fearful. His world only consists of orders, missions and family. Love has never been in his life plan. With respect for soldiers and his original intention as a doctor, Su Wan came to the remote military central hospital and used a scalpel to protect every soldier who returned from the bloody battle. During an emergency rescue mission, Lu Zheng led the team back after being injured. Su Wan was ordered to do something in danger. He fought with death on the operating table and entered the world of this cold man for the first time. Iron-blood collided with tenderness, responsibility and love were intertwined. They supported each other in the bloody years of the military camp, and stood firm to each other in the test of gathering less and leaving more. Lu Zheng wears camouflage to protect the peace of his family and country, and Su Wan wears a white coat to protect the date of his lover's return. When smoke meets tenderness, when perseverance meets deep love, can they find their own fiery life between mission and love?