Three heroes and a Sea King

The heroes have family troubles. To unwind, they decide to quickly go to China for the dragon's tooth, a symbol of wisdom and strength. At the same time, Prince of Kiev goes for a walk with his horse Julius for the treasures of the sea king in order to replenish the treasury and "patch up the budget." But the sea king decided to get married and drowned Kiev for this. What should I do now? What will help our heroes? Friendship, courage and, of course, love.