Many Brazilian superstars, such as Pele, romario, Ronaldo and Ronaldinho, come from slums, and many of them choose to play football for a living. Only Kaka didn't. He did it out of interest, and in high school, Kaka got very good grades, especially in math. He wants to be an excellent engineer like his father. But in the end, Kaka chose football because he loves football so much.