Five gangsters escape in a van after a bloody confrontation with the rival Chunno gang.
So the monks propose that if the gangsters can win three of five contests, they can stay, but if they lose, they must leave immediately.
The gangsters win enough contests, the last being suggested by the eldest monk: a challenge to fill up a broken water pot without plugging up the hole.
But the younger monks can't stand the gangsters and attempt to persuade them to leave.
Former members who defected to the Chunno gang show up near the monastery, dig a shallow mass grave and throw the gangsters they betrayed into it.