South Korea's 'secretive centre' for N Koreans
6 December 2012 Last updated at 14:13 GMT
The number of North Koreans escaping to South Korea has more than doubled over the past decade, so authorities have built a new processing centre to cope with the influx.
The facility can house up to 500 people and offers training in South Korean lifestyle and values.
The BBC's Lucy Williamson was given rare access to the centre.