A red-light district is a part of an urban area where there is a concentration of prostitution and sex-oriented businesses, such as sex shops, strip clubs, adult theaters, etc. The term originates from the red lights that were used as signs of brothels. There are areas in many big cities around the world which have acquired an international reputation as red-light districts. Some red-light districts have acquired a touristic interest beyond sex tourism, and can be perceived as places of artistic, historic or cultural interest, whether or not they still serve the sex trade.
Seoul (English pronunciation: /soʊl/; Korean: [sə.ul] ( listen), "Capital City", from ancient Sillan "Seorabeol"), officially the Seoul Special City, is the capital and largest metropolis of South Korea. A megacity with a population of more than 10 million, it is the largest city proper in the OECDdeveloped world. The Seoul Capital Area, which includes the surrounding Incheon metropolis and Gyeonggi province, is the world's second largest metropolitan area with over 25.6 million people, home to over half of South Koreans along with 632,000 international residents.