Which song is full of white teeth?

Call brother and come back early. Call My Brother Come Back Early is a Chinese song, which is composed by singing, lyrics by Lu Yao and music by Xu. It's an episode in the movie Life. The theme of this song is love, and the lyrics depict the protagonist's yearning and expectation for his distant brother, expressing deep love and endless waiting. The song has beautiful melody and touching lyrics, which are deeply loved by the audience.