In a sudden emergency mission, Zhang Duhang, a military doctor of the escort formation, was quickly transferred to the naval medical ship "Ark Peace". During the mission, Zhang Duhang and female military doctor Lu Ziang were incompatible with each other due to different medical concepts. Coincidentally, the two were transferred to a department and had to deal with various emergency tasks. Through life-and-death missions together, they also got closer and closer, and together with the "Peace Ark", in order to vigorously promote the humanitarian spirit, the concept of "harmonious world, harmonious ocean" has been widely spread, and a heroic hymn of the contemporary Chinese navy has been written.