Runner-Up's Revenge

From golden child to rock bottom - that's how far he fell. Once the undisputed star student headed to Seoyon University, Dowon had it all: perfect grades, endless praise, and an ego to match. Now he's scanning barcodes at a convenience store. Then she walks in - the girl who always came second, the eternal runner-up from their school days. And she brings with her all the consequences of his past arrogance, ready to collect on an overdue debt.

Original Novel:
Mofic, Naver Series, KakaoPage, MrBlue, Joara, Mootoon, KyoboBook