Yeon-hong, a promising high school baseball player, ends up losing everything. Both his parents and baseball, gone in an instant after a traffic accident. However, when he discovers that the accident was a scheme by loan sharks his parents owed debts to, Yeon-hong takes the path of a moneylender himself, all for the sake of revenge.

Twelve years later, Yeon-hong runs the moneylending firm KoKo Loan. Coerced by his financial backer, Chairman Yoo, Yeon-hong was entrusted with the "Panther", which seems to be Chairman Yoo's lover...