Plot: Ragnarok Online is a massive multiplayer online role-playing game created by Gravity based on the manhwa Ragnarok by Lee Myung-jin. It was released in South Korea on 31 August 2002 for Microsoft Windows. Wikipedia
Plot: Ragnarok Online 2: Legend of The Second is a massively multiplayer online role-playing game developed and published by Gravity Co. and is the sequel to Ragnarok Online. Wikipedia
Plot: Ragnarok Online: Valkyrie Uprising is available free and requires online connectivity to play. Designed to look and feel like the original PC MMORPG Ragnarok Online. Published by NEOCYON in April 2013. Available on iOS and Android. The game now renamed to Ragnarok: Path of Heroes Wikipedia
Plot: Tree of Savior is a free massively multiplayer online role playing game developed by IMC Games. The game was developed by Kim Hakkyu, creator of Ragnarok Online while the game's background music was ... Wikipedia
Plot: Lineage 2: Revolution is a massively multiplayer online role-playing game developed by Netmarble for mobile platforms under license from NCSoft, taking place 100 years before the events of NCSoft's Lineage II: Goddess of Destruction storyline. It is part of the Lineage series. Wikipedia
Plot: Swordsman was a free-to-play massively multiplayer online role-playing game by Perfect World Entertainment and is currently available exclusively on Arc. Closed Beta began on June 16, 2014, and was open to all users with a Closed Beta key. Wikipedia
Plot: La Tale is a 2D side-scrolling online game developed by South Korean studio Actoz Soft. Gamers take the role of adventurers in a mythological fantasy world with three continents, Jiendia, Freios, and Eastland. It was launched in South Korea in February 2006 where it was well received. Wikipedia