In a sudden emergency mission, Zhang Duhang, a military doctor of the escort formation, was quickly transferred to the naval medical ship "Peace Ark". During the mission, Zhang Duhang and female military doctor Lu Ziang were incompatible with each other due to different medical concepts. Zhang Duhang didn't look down on Lu Ziang who was too sensible and calm, and Lu Ziang didn't look down on Zhang Duhang, who was born in a "wild road". In a lapse of time, the two were transferred to a department and had to bite the bullet to deal with various emergency tasks; merchant ships in distress, transnational disaster relief, fighting the virus, overseas anti-terrorism - In the test of blood and fire, the two were born to death, dedicated missions, two The heart is also getting closer and closer, and together with the "Peace Ark", in order to vigorously promote the humanitarian spirit, widely spread the concept of "harmonious world, harmonious ocean", and composed a heroic hymn of the contemporary Chinese navy.