Superstar's participation attracts many fans' attention. However, given this opportunity, how effective a social media is when creating content and running advertisements determines the success or failure of a marketing. Our company has been responsible for the offline promotion of strawberries by Lee Seung-gi in 2018 and Park Ji-hoon in 2019 through online contents and social media, and despite the very complicated rules, we have successfully gathered 300 and 400 participant