As predicted by media gurus, Internet and digital communication technologies are reshaping media industry worldwide. Compared to old unidirectional broadcasting, new interactive broadcasting is emerging. The most powerful online live streaming service in Korea is AfreecaTV, which enables synchronous communication with other audiences and the content provider called BJ (Broadcasting Jockey). The purpose of this study is to find out how important real-time communications are in watching TV. The research findings evidenced that audience activity, viewing motives of information/audience interaction, entertainment/habit-pastime, and BJ interaction lead to higher audience satisfaction. Also, the research supported that higher viewing motives of information/audience interaction, sexual curiosity, and BJ interaction highly influenced audience activity. Therefore, AfreecaTV should focus on encouraging BJs to interact with audiences actively including fine quality of chatting and audience-participated content. Surprisingly, however, there were no significant relationship between viewing motive of sexual curiosity and audience satisfaction. Also, viewing motive of entertainment/habit-pastime had negative impact on audience activity. One of the most important findings of this study is that real-time interaction is important in watching online live video streaming service, because along with the self-motivation to interact with other audiences, the effort of the content provider to interact with audiences has also critical role in improving audiences’ motivations.