OPstar, formerly known as OPmart, is a directory service for finding business listings by region and category across South Korea. Its information guide helps visitors navigate listings in areas including Seoul, Gyeonggi, Incheon, Busan, Daegu, Daejeon, Gwangju and Jeju. Users can narrow searches by location and service type, then review available business details such as location, operating hours, ratings and links to reviews. The site also provides guidance on checking current information, since prices, opening hours and other details may change and should be confirmed on the relevant listing page.

Alongside its directory guidance, OPstar publishes general information about massage categories, including Swedish, aroma, Thai, sports and relaxation massage, describing common characteristics and typical session lengths. Its guides explain how to compare options, assess review dates and relevance, and verify an establishment’s details before visiting. The site identifies the official OPmart page as opmart24.com and advises visitors to check website domains before entering personal information. It is designed to make regional and category-based business information easier to explore.