Sang Thong (2004)

Queen Chantawee is banished from the Kingdom when she gives birth to what appears to be a conch and goes to live in the forest as this a sign of past misdeeds in her previous lives. However there is a child inside the conch shell who comes out occasionally to do chores like housecleaning. When his mother realizes there is a child in the shell she breaks it and he comes out to live in their house. He has many mysterious powers and can change the way he looks anytime he wants. Returning as paupers to the Kingdom years later they are eventually recognized and propelled into high society. He is chosen to be the main player in a game against an opposing Kingdom that wishes to go to war. The outcome of the game will decide if there is war or not.