I Ate the Wishing Dragon That Could Defeat the Whole World

Dad said that when I was born, an evil dragon flew from nowhere and wanted to destroy the city. I opened my mouth and cried, and the evil dragon disappeared. He said this in a joking tone. But only I know that in my dreams every day, there is a dragon in my body struggling to come out. It told me that as long as I gave it seven dragon balls, it could fulfill all my wishes.