The film tells the story of three cardiologists, Zhou Xiaofeng (played by Mark Chao), Fang Xiaoran (played by Mao Xiaotong) and Lin Yi (played by Jin Shijia), who met by chance at the Heart Center of Dongli Hospital. The three had frictions and collisions due to their different professional backgrounds and career concepts, and then gradually reached a tacit understanding in the process of treating and saving people, and finally fought side by side in the battlefield of life.