Heroine*hot nerd
Sapiosexuals save the world
The school bully bullies the heroine in public just because he heard that the heroine he likes is fat and ugly.
After going to college, the heroine lost weight and became the beauty of the college. He was just one of many suitors.
Faced with the heroine's sudden favor, the school bully went from being flattered to being arrogant, but she actually chose the school bully for the nerdy boy she really liked.
Purpose: Study hard and become a hot nerd