Natural City( 내츄럴 시티 ) is a 2003 South Korean science fiction film about a colony world that integrates robots , androids and cyborgs amongst the population.

The story revolves around two cops, R and Noma, who hunt down renegade cyborgs. The cyborgs serve a number of duties, ranging from military cyborgs that serve as commandos to "dolls", female cyborgs engineered for companionship . They also have only a limited 3 year lifespan, although black market technology is being developed to transfer the cyborg's artificial intelligence into the mind of a human host.

This breakthrough drives R into finding Cyon, an orphaned fortune teller/prostitute, who may serve as the host for the mind of his doll Ria, whom he has fallen deeply in love with and has only days to live.

Eventually R must choose between leaving the colony with Ria to spend his last days with her on a paradise-like planet, or help save his friends when a renegade combat cyborg takes over the police headquarters.