The protagonist is one of the growing group of poor North Korean refugees who are trying to adapt in capitalist South Korea. The maker, former assistant director to Lee Chang-dong, has made a deeply moving and profound film about the position of the unwanted guest.
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At first the whole "calvary" the protagonist goes through was too much of a weak point. Then, considering it by his christian perspective and filtering his guilt as a former murderer (guilt as a former communist), the movie started to take shape as an honest tale of the cruel entering in the capitalist world, distortedly viewed as the working purgatory to Capital Heaven. Everybody pays for their "original sin".