Due to a sudden emergency mission, the superior quickly transferred the escort fleet's military doctor Zhang Duhang to the Navy Medical Ship "Peace Ark". During the mission, Zhang Duhang and female military doctor Lu Ziang were incompatible due to their different medical concepts. Zhang Duhang looked down on Lu Ziang, who was too rational and calm, and Lu Ziang also looked down on Zhang Duhang, who came from a "wild" background. By chance, the two were transferred to the same department and had to bite the bullet to deal with various emergency tasks; merchant ships in distress, transnational disaster relief, fighting viruses, overseas counter-terrorism... In the test of blood and fire, the two went through life and death, dedicated themselves to their mission, and the two hearts got closer and closer. Together with the "Peace Ark", they vigorously promoted the humanitarian spirit and widely spread the concept of "harmonious world, harmonious ocean", composing a heroic hymn for the contemporary Chinese Navy.