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Compared to some other Asian countries, it is not common for the local people in South Korea to invite travellers to their homes. A tent is useful. Finding a place to sleep just outside of cities can sometimes be difficult, as this is a densely populated country and often the outskirts of one city are simply the beginning of another city. However, there are rural places that are easy to reach from city centres, such as the mountains outside of Seoul. If you don't mind to sleep in the streets, city parks are very good option, being central with clean toilets nearby. The only problem is, that Koreans love their early morning sports.