A group of unlikely heroes from across the Korean peninsula try to save the day after a volcano erupts on the mythical and majestic Baekdu Mountain.

'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!

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.