The purpose of this study is analyzing the interactive mechanism of developer storytelling and user storytelling in MMORPG by Ian Bogost(2006)\'s Unit Operation theory. Unit operations are modes of meaning-making that privilege discrete, disconnected actions over deterministic, progressive systems. As a result, this paper fhind hit that developer storytelling has 4 units-① called, ②explore, ③battle, ④achieve, and user storytelling has 4 units-① move, ②accompany, ③breach, ④socialize. Unit operations of developer storytelling and user storytelling keep on combination and dissolition by interactivity. And the unit operations make the dhis paher f structure as DNA in human. MMOPRG storytelling is made by dhis paher f structure of developer storytelling and user storytelling. Thus MMORPG can produce emergent storytelling and endless rhizome. Keyword: MMORPG storytelling, Onlinegame narrative structure, unit operations, double helix structure.