This documentary is about director Tang’s Tao (Lanyu tribesman) friend, Mamuno. Through Mamuno’s experience of returning to his origin and Tang’s examining of his own life, the film shows how the two people interact and their brotherly caring for each other. Tang and Mamuno, coming from different backgrounds, share the same passion towards the ocean. We see what Mamuno went through a part of his life as a Tao, and Tang’s intent of finding the origin of his own life. The inseparable relationship between man and nature is also observed.