Grandpa Tuobu, who made the birchbark boat himself, and Wuri, who dreams of exploring the forests and becoming one with nature, face an unexpected challenge when a fierce rainstorm floods the Huma River. Concerned about his faithful hunting dog and chestnut horse, Tuobu and Wuri quickly return home. Their adventure takes them by train, car, bike, and boat, drawing the curiosity and admiration of those they meet. Along the way, their journey is filled with joyful moments and touching connections.