MMORPG is an online role-playing game in which a large number of players share a game world and develop their characters. Since the world\'s first commercial graphical MMORPG, \"The Kingdom of the Wind\" by Nexon was launched on Nov. 1992, most MMORPG\'s have been providing repetitions of leveling-treadmill to players which is considered more simple and more static. This paper suggests the concept of dynamic game world for MMORPG which is one improvable way of limited interaction. The world derives emergent storytelling between players and provides immersive environment to players. Moreover, since the world changes continuously itself, the game could be updated with minimum new game contents, which makes lengthen the game life. Keywords : MMORPG, Game World