broadcast by TV Chile to other continents dubbed into Spanish. Ratings and viewership Viewership ratings are provided by two companies in South Korea: Nielsen Korea and TNmS. Originally, Media Service Korea (MSK) was the sole company providing TV viewership ratings using people meter since 1992, but was only limited to Seoul Capital Area. In 1998, TNS Media Korea began as a rival company in partnership with Taylor Nelson Sofres (TNS) which extended the service to five major cities; it was officially launched in June 1999 with a more sophisticated viewership rating survey technique. While, in August 1999, AC Nielsen acquired MSK and rebranded it as AC Nielsen Korea and expanded the audience rating survey to the whole country with the aim to increase the credibility of the ratings. In 2005, AC Nielsen Korea signed a merger with AGB Group and AGB Nielsen Media Research was established. AGB Nielsen Media Research merged with KADD Nielsen Media Research in January 2013, and the official name was changed to Nielsen Korea. In 2010, TNS Media Korea was renamed to TNmS (Total National Multimedia Statistics). Since late 2018, TNmS stopped providing data to the public through their websites, and instead occasionally releases the ratings through news agencies such as BreakNews. List of highest-rated series on terrestrial television The list was compiled from data by Nielsen Korea, based on the episode of the highest viewership since 1992. By household rating By viewers List of highest-rated series on cable television By household rating By viewers See also Chinese television drama List of South Korean television series History of Korean animation Japanese television drama Manhwa Mass media in South Korea Taiwanese television drama Television in South Korea Webtoon Footnotes References Bibliography Asian drama Television drama