Su-ji is trapped by Ha-rin's blackmail. She feels bad keeping a secret from Ja-eun. The class goes on a school trip. Tension builds until everything explodes in a game of survival.
A religion is a belief system with rituals. The missionary kopimistsamfundet is a religious group centered in Sweden who believe that copying and the sharing of information is the best and most beautiful that is. To have your information copied is a token of appreciation, that someone think you have done something good.