Dragon Ball: What if Son Goku became an evil villain?

(Million-word completed old book Dragon Ball: From Becoming the King of Saiyans, select the author's new book) When the former hero becomes a dragon, who can subdue the dragon? In a certain Dragon Ball world, the former great hero Son Goku accidentally awakened the evil Saiyan personality and slaughtered all his companions in the Dragon Ball world. Only Son Goku's eternal rival Vegeta survived. In order to change the doomsday of destruction, Vegeta, who merged with the soul of the traveler, gambled on the name of the Saiyan and decided to go to the starting point of the story to turn the tide! Kakarot! The only one who can kill you is me, Vegeta! ...