I'm going to make an educated guess that she wasn't just popular in college, but also high school or even before that. Being chased by guys for that many years, and being real life instead of a k-drama, she's probably gone out with at least several guys she liked. That's probably why she reacted like her friend foolishly exposed her and playfully hit her for it because that shouldn't have been said.

the belt pulled tightly and underneath her top is a flat chest

the belt is pulled very tightly

your waifu, what level is she at

1. sex oblivious
2. sex curious
3. sex knower
4. sex haver
5. sex enjoyer
6. sex addict
7. sex demon
8. Whore of Babylon
9. a Sullyoon

she loves us