This study has verified the structural relationship between the influencer’s authenticity, the user satisfaction as well as the eWOM intention and loyalty amid the controversy over authenticity that becomes a social issue due to the delivery of influencer’s overstated and false information. In order to verify the hypothesis, 304 adults who have experience in using sports contents on SNS were identified for fit indices and resulted the degree of χ/df=2.234, NFI=.920, TLI=.965, CFI=.972, RMSEA=.064. According to the research result, influencer’s authenticity was found to have a significant effect only on use satisfaction (β= .855, t=17.977***), and in the case of use satisfaction, e-wom intention (β=.1.179, t=3.929***), and e-wom intention has a significant effect on loyalty (β=.470, t=4.191***). It has been identified that if a user group does not have any positive recognition of influencer’s advertisement, no matter how authentic the advertisement is, the group will not experience user satisfaction, which will not continue to eWOM and loyalty. Thus, in order to maximize the effectiveness of loyalty, influencer needs to consider various features that can satisfy the users through active communication, appropriate editing, and professional knowledge of influencers with authentic content delivered.