Ragnarok Online is a popular MMORPG developed by Gravity Co., Ltd., inspired by Norse mythology and the manhwa Ragnarok by Lee Myung-jin. The game features vibrant anime-style graphics, extensive character customization, and a unique job system. Its success also led to various adaptations, including anime series and spin-offs. The main title remains 'Ragnarok Online', which is widely recognized as the core of all related media.