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Sang-gu, a notorious teenage street fighter, gets tired of fighting when he realizes there’s no match for him anymore. However, one day, his best friend Moon-je gets beaten up by Min-gook, the champion of mixed martial arts tournament in his school. Outraged by what happened, he decides to transfer to Min-gook’s school for revenge and enters the tournament. As he beats other opponents one by one, he gets closer to the big shot of the school, Min-gook.
'Junsu' a bumpkin who hates studying, 'Seok-tae' a bumpkin who hates to go to the army, 'Cheol-woo' a bumpkin who has nothing to do. The so-called "Righteous Bully" trio decides to go to Seoul with their mother's secret money. They arrived in Seoul, filled with dreams of a bumpkin, but on the verge of losing their money in front of their eyes. To make matters worse, they reunite with their senior, 'Man-su', and gets caught up in an entangling case that becomes out of control. The "Kkangchi" trio from Gyeongsang-do takes over Seoul!
Though the mother of the Mulberry children tries to keep her family away from the destruction and violence of street life, one by one, the children are all sucked in. When youngest daughter falls for a violent drug dealer, it's all the mother can do to hold her family together.
