OGN ran high level professional tournaments for 20 years; its premier competition included the Ongamenet Starleague (OSL), Proleague, League of Legends Champions Korea, and Overwatch APEX.

Most recently, League of Legends statistics website, OP.GG, which also sponsored LCK since 2022, has acquired OGN from CJ ENM[1] following the shutdown of the linear TV network during the COVID-19 pandemic.

[citation needed] There had been a total of 34 OSLs for StarCraft: Brood War dating from October 1999 to August 2012.

Soon after, controversy sparked when League of Legends developer Riot Games declared that the broadcasting rights of the LCK would be split between OGN and its main competitor, SPOTV.

This transition coincided with the construction and opening of LoL Park, a new stadium and studio that would function as the new location of all LCK competition.

For its short, year-long reign, the APEX tournaments were regarded as the highest level of Overwatch competition at the time.

OGN were not given the rights to broadcast Contenders Korea and, to establish control of all Overwatch esports activity, Blizzard placed many restrictions on third-party tournament organizers, effectively ending OGN's hopes of continuing to hosts tournaments outside of the main OWL/OWC circuit.