Oh Yeon-seo Born Oh Haet-nim (1987-06-22) June 22, 1987 Jinju, South Korea Education Dongguk University Occupation Actress, singer, model Years active 2002–present Agent Imagine Asia (2006-2017) Celltrion Entertainment (2017-present) Height 170 cm (5 ft 7 in) Weight 48 kg (106 lb) Musical career Also known as Haet-nim Genres K-pop, Dance Years active 2002 - 2003 Korean name Hangul 오연서 Hanja 吳漣序 Revised Romanization O Yeon-seo McCune–Reischauer O Yŏnsŏ Birth name Hangul 오햇님 Hanja 吳寒妮 Revised Romanization O Haet-nim McCune–Reischauer O Haetnim