Natural City (Korean: 내츄럴 시티) is a 2003 South Korean science fiction film, set in a dystopian[2] future, about a colony world that integrates robots, androids and cyborgs amongst the population.

The cyborgs serve a number of duties, ranging from military commandos to "dolls", engineered for companionship.

They have a limited 3-year lifespan, although black market technology has been developed to transfer a cyborg's artificial intelligence into the brain of a human host.

This breakthrough compels R into finding Cyon, an orphaned prostitute, who may serve as the host for the mind of his doll Ria.

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