The purpose of this paper is to identify the MOBA storytelling based on the concept of persuasive technology. Most of online games use spoken or written language to make the player's belief in fictional game universe. Unlike early online games such as MMORPGs, MOBA games use the character voice-over for persuasion. This paper sets up three hypotheses that are related to the process of persuasion. First, character quotes can show the character's affiliation information as regional keyword. Second, taunt quotes can show the information about relationship between game characters. Third, all types of character quotes can reflect the updated contents of game. This paper chooses the League of Legends as the example of MOBA games, and analyze the quotes in the game. As a result, three hypotheses are true.