Peeta doesn't want to be 'a piece' in the Hunger Games, and he wants to die the same person he is now. He doesnt want the Games to change him.
He met a hubshi girl who seemed interested with Santosh. Furthermore, he got English lesson by her and their relationship became closer. This event makes Santosh realizes of his existence after he feels alienated by his surrounding before. Since then, he took so much care of his physical appearance.
It helps you and develops your skills.
The main event is what people most look for The main part