Ragnarok Online (Korean: 라그나로크 온라인) is a massively multiplayer online role-playing game (MMORPG) based on the manhwa Ragnarok by Lee Myung-jin. The game has spawned an animated series, Ragnarok the Animation, and a sequel game, Ragnarok Online 2: Legend of the Second. Player characters exist in a world with a player environment that gradually changes with the passage of time. Major changes in the features and history of the world take place as episodes in the RO timeline. After a thousand years of a fragile peace, clues showing that the war between Gods, Humans and Demons, that was once responsible for an unspeakable destruction, could have started to appear. As troubling events happen, rumors rise about mysterious and evil forces coming back to life.