Why are people keep saying about some kind magical transformation from ugly to chad? He wasn't ugly to begin with. He is just normal looking guy who never though about his appearance or style. Stupid haircut, plain clothes, random glasses, nerdy behavior and you got guy who is unseen by anyone. So some hair work, make-up, flashy costume and no glasses could make trick, but it's something actually happens IRL. And it's not like he became the hottest guy in the school but enough to attract some attention. Chapter 21 gave hints