In order to follow his childhood sweetheart Lu Ye, Lin Nian gave up the opportunity to study abroad and became a doctor in the military hospital. However, Lu Ye always avoided his love for Lin Nian because of his ex-girlfriend's death in the mission. The two got close during life and death missions, but were repeatedly pulled apart by Lu Ye's occupational disease and Lin Nian's insecurity. When Lin Nian finally experienced life and death on the battlefield and thought he had warmed the stone, Lu Ye chose to let go because he had to abide by his promise to his sacrificed comrades and consider Lin Nian's future. In the end, Lin Nian went to Africa to aid the medical team. The two of them looked at each other from afar on both sides of the border, each guarding the olive tree and the military flag in their hearts.
