Sug-i, a poor North Korean girl is ordered by the communists to go into the mountains and bring wild ginseng for the Red Chief. She wanders around in Mountain Geumgang, where she slips over a rock. Ttoli lives in the mountains with the wild animals and is also called Jang-gun. He saves Sug-i with his animal friends. Through Sug-i, he comes out into the world and comes to learn of his past. His parents had tried to escape from North Korea but had been arrested, and Ttoli had been abandoned. Meanwhile, with the Red Chief's birthday approaching, communists force workers to "dig the tunnel faster," "make a trench," and "bring wild ginseng." Ttoli, catches on to the communists' plans. Together with his friends, he defeats the North Koreans who were digging the third tunnel, saves his father who was among the prisoners, and finally comes face to face with the Red Chief.