The sun king and the moon priincess

The Moon Kingdom have one prince and one princess, people in Moon kingdom though that prince will be cheerful and full of energy, the princess will be like a lady that everyone wanted but it was opposite, the princess who cheerful, energetic and like to go out the castle, kingdom and go to another planet and kingdom, that why King and Queen always worried if something dangerous happens to princess, the prince who always study and train for preparing to become a King even though still far for that

The Sun Kingdom have one prince, at an early age, the king of the Sun Kingdom die at unknown illness, the prince become king, the Queen worried to her son decided to become King even though still early for him but the new king didn't care he wants to fulfill his promise to the late king that he will protect the Kingdom, the Queen, and the future Queen