Legend of Sudsakorn

Legend of Sudsakorn Thai is a 2006 Thai fantasy film. It is based on a story from Phra Aphai Mani, an epic poem by Sunthorn Phu. Charlie Trairat, the young male lead from Fan Chan, portrays the title character, a boy who is the son of a mermaid who is sent on a magical quest to find his father, a prince. It is a mix of live action and computergenerated imagery.

Source: Wikipedia