Cai Zhu is a bamboo fairy who does not have a heart and does not understand human lust. She is sent into the human world by the Queen Mother and must understand the human heart before she can return back to heaven. There she met Wang Hu Po, a human with a super high "Yin Virtue" in the world, as well as the rest of his loving family. Since meeting them, Cai Zhu discovers that there can be wonderful relationships developed between humans and immortals. But can this upright bamboo fairy successfully understand the human heart?