Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
A young boy who lives on a temple that floats in a Korean lake. One day as he is walking along a creek, he ties stones to several animals, including a frog, so it can hardly move. We see it try to swim away but getting nowhere. As punishment for torturing animals, the master ties a large stone to the boy when he is sleeping, then makes him drag the stone back uphill to free the animals. He finds the frog alive and is able to release it.