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High school students from all over South Korea compete against each other to find out who is the best high school rapper.

Though he runs an illegal detective agency, Hong Gil-dong’s reputation as a detective outshines that of so-called legitimate detectives. He’s brilliant, observant, and quick-witted. The only thing that casts a shadow over his otherwise successful career is that he hasn’t caught one person he wants to catch the most, Kim Byung-deok, the criminal who brutally murdered Gil-dong\'s mother. After twenty years of pursuing his mortal enemy, he finally discovers whereabouts of Kim Byung-deok. However, Kim Byung-deok has been kidnapped by someone, and what await Hong Gil-dong at Kim Byund-deok’s place are Kim Byung-deok’s two granddaughters, Dong-yi and Mal-soon. Having no choice but to take along the little girls who ask him to find their grandfather, Gil-dong continues with his search of Kim Byung-deok. However, he soon realizes that he has gotten himself entangled in a net of a much bigger conspiracy ensnarled by a powerful criminal organization called Kwangwoonhwe.

The program truly records the living conditions, eating habits, and exercise habits of each guest. The stars observe with the other guests and watch their different lifestyles! All about being healthy and leading a good lifestyle.