The theme of the thief king expresses the process of people chasing dreams. When I was young and confused, I was told one by one what my dream was. When Luffy broke the predicament again and again with indomitable spirit, my young mind was greatly shocked. When Luffy started sailing, he met one interesting partner after another. Everyone has his own dream, and everyone works hard for it. Luffy wants to be one piece, Sauron wants to be a great swordsman, Nami wants to draw a map of the world, Wu wants to be a brave sea warrior like his father, and wants to find a dream sea with all the ingredients of the four seas. Robin wants to find historical texts to understand history, Francci wants to watch his ship travel around the world, and Brooke wants to fulfill his vow 50 years ago to find the whale Rab in Gemini Canyon. Everyone supports each other for different dreams and becomes indispensable partners.