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Do Il Chool is a poor college student who is talented in playing poker. One day, he meets a woman nicknamed Madonna, who was with a mysterious gambler. Il Chool borrows money from loan sharks and plays against the man, where he losses and lands in debt. Weeks later, Il Chool is haunted by loan sharks when he meets Ae Kku, a famous gambler nicknames the One-Eyed Jack, who forms a team with Il Chool and other notorious swindlers to get revenge and win 5 million dollars by gambling against Old Man Mool.

15-year-old Yoko, a young girl who is constantly tormented by her self-centered and devilish older sister Makiko, who works for a government office after having graduated from a famous university. But despite her ill nature, Makiko's actions tend to somehow make things better for those around her, causing others to praise her as an "ally of justice."