In a dilapidated martial arts gym in the old city that is about to close down, a useless master who talks about running around, is in debt everywhere, and seems to be the most useless, leads four apprentices who have their own problems and make jokes and fool around in life - until one day a crack opens under the city, and the apprentices know: the phrase "under this restaurant, but there are things under control" that the master has been bragging about for ten years was never a boast.
