Here is a regulation that I did not realize Seoul enforces on people camping along the Han River:

As growing numbers of people visit parks along the Han River for autumn picnics, Seoul city’s current regulation, which forces them to leave two sides of a tent open at riverside picnic areas is sparking debate over privacy concerns.
The Seoul Metropolitan Government allows tents at designated picnic areas in Han River parks during scheduled times under the condition that at least two sides of a tent remain open at all times.
The city government established the regulation in its April 2019 ordinance, in response to growing complaints regarding indescrete public displays of affection inside the tents and waste problems, according to the city government’s team which is in charge of park management. Seoul is the only local government nationwide that imposes such a restriction.
Korea Times
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