Jo Yoon-seo (Hangul: 조윤서, January 4, 1993), also known by her stage name Yoon Seo (Hangul: 윤서), is a South Korean actress born in the City of Mungyeong, Noth Gyeongsang Province, Republic of South Korea. Jo Yoon-seo (Hangul: 조윤서, January 4, 1993), also known by her stage name Yoon Seo (Hangul: 윤서), is a South Korean actress born in the City of Mungyeong, Noth Gyeongsang Province, Republic of South Korea.