The Liar and His Lover
Lee Hyun-wooKang Han-Kyeol Lee Jung-jinChoi Jin-Hyuk Kim In-kwonHomeroom Teacher Lee Seo-wonSeo Chan-Young Hong Seo-youngChae Yoo-Na Jung Yoo GeunKang Han-Kyeol (child) Lee Yoo-jun[sound engineer] Lee Seo HyeonYoon So-Rim (child) Kang Woo-je[Yoo Hyun Jung's assistant] Kim Yong-geon[Yoo Hyun Jung's father, chairman Who Entertainment] Park Jong HyukLee Kyoo Sun Yoo Joo-wonLee Kyoo Sun (young) Yang Kyung-won[director of the competition] Lee Jun Yong[ member boy group from show "Produce 20"] Lee Sang Ho[ member boy group from show "Produce 20"] Go Bon Kuk[ member boy group from show "Produce 20"] Han Jae Un[ member boy group from show "Produce 20"] Kim Jiwoong[ member boy group from show "Produce 20"] Kotomi AokiOriginal Story 
