Lee Yoon-ji as librarian Ma Jae-in Ep. The dating agency korean drama Yoon-ji as librarian Ma Jae-in Ep. After Seo Byung Hoon Lee Jong-hyuk loses his best friend in an korena once-renowned theater director suffer from guilt and decides to save his late friend theater troupe. A 19 years old high rhe who dream of becoming a theater actor! Cast Lee Jong-hyuk as Seo Byung-hoon. Kim Min-kyo as Go Young-dal! PARAGRAPH. Choi Woon-young as the sommelier Yoo-jin likes Ep. Choi Sooyoung as Gong Min-young. He is attracted to Min-young.