 The series has been acclaimed for its use of old Korean language and allusion to Korean medieval history and mythology in the world's creation.Lee's "Dragon Raja" world and its main characters have been used as a basis for a MMORPG, Dragon Raja Online, or DRO.The game began development in 1998 with the investment by Samsung Electronics, and was released in 2000 in South Korea, and later in 10 countries including Taiwan and China as 龍族.