in 2000, a single series channel was introduced as a sister channel to the original m-net channel. on 9 july 2013, this channel was split into three, namely m-net series showcase, which was broadcast in high definition, previously served as the primary series channel on which most new content unique to series was broadcast, m-net series reality broadcast talk shows and other reality media, and m-net series zone which served as a catch-up channel, and featured previous seasons of shows. several tv shows also ran back-to-back in marathon blocks.