One day,the King of the Sea is trapped in a conspiracy by Imogen who plans a revolt. The King takes a poisonous drug and gets sick. The medicine that will cure the King of the disease is said to be a rabbit’s liver. Hero goes ashore to the land world in place of his father,General Tagul. Hero succeeds in tricking and bringing the rabbit to the Sea World. But the rabbit Amy pulls through the crisis by telling a lie; Amy says she left her liver up in the Miracle Mountain. Amy and Hero set out on a long journey to the Miracle Mountain in search for the liver. During the journey,Amy always looks for a chance to run away but it’s not easy to escape far away from Hero because of the necklace that Amy is wearing. Duji,the ostrich that can’t fly,believes that the wizard living in the Miracle Mountain can make him fly. With this belief, Duji joins Hero and Amy and they all head for the Miracle Mountain. Meanwhile Imogen,after failing in conspiracy,attempts to seize the reign of the Sea World by using the force of a wicked ghost,Jack,which has been put under the seal for a long time. Imogen becomes more powerful after being instructed in magic force by the wicked ghost Jack. Imogen then threatens Hui the cat,the boss of a gang to chase after Hero. The Hui gang unwillingly follows the Hero party and tries to stop them but it’s always Hui that falls into trouble.

Hero and his friends build friendship as they fend off the attacks from the Hui. They go through adventures and meet cute and charming friends in the forest. There’s the baby raccoon dog,Nicky,who is always kindhearted despite all the annoyance from the half-blooded fox brothers. There’s also the smart-looking beaver “River” who rides the skate board,and the pigs that have become skinny because of the wolves that rob them of their grain every year. An exciting and charming adventure story! What will Amy say about her lie in the end and how will she pull it off ? In the meantime,as the wicked ghost Jack seeks a complete return to life,he needs the herb of eternal youth possessed by the wizard living in the Miracle Mountain. The wizard says he can give the herb in exchange for the one thousand-year-old coral sword that Hero is carrying. Hero and his friends who have no knowledge of this, continue to head for the Miracle Mountain repelling the attacks from the Hui gang.
The duel between the wizard of the mountain and the wicked ghost Jack approaches. Jack succeeds in obtaining some of the herb and in restoring to life,though not completely. But Hero finds out a flaw of the wicked ghost Jack and puts him under the seal again. Hero brings the rest of the herb to the Sea World and offers it to the King of the Sea.