Talk to the King of Children and he will say that you must give him 3 custard tarts to stop them from bullying Keru the Lala . Go to the southern part of the town over the bridge and the second house you see will be the props shop where you can buy custard tarts for 70 gold each. Go back to the king of children and give him the custard tarts, then a girl will come up and give you the reward for saving him.