Seo Yeaji Hangul 서예지 born April 6 1990 is a South Korean actress and model She debuted in cable channel tvNs sitcom Potato Star 2013QR3 Following her debut Seo served multiple performances that were all critically acclaimed She was also praised from viewers as the New Thriller Queen when she starred in OCN thriller mystery television series Save Me 2017 On January 2020 Seo joined newly established entertainment agency Gold Medalist as one of the two senior actors under the organization alongisde Kim Soohyun Seos first venture with her new management company came with tvN and Netflix broadcast romance drama Its Okay to Not Be Okay 2020 Her acting caught attention globally The New York Times named the series one of The Best International Shows of 2020 and described Seos performance as mesmerizing She also experienced a substantial rise in popularity and attracted media attention in Korea and internationally following her performance as the antisocial author Ko Moonyoung