Oh Haet-nim (Korean: 오햇님, born June 22, 1987), known professionally as Oh Yeon-seo (Korean: 오연서), is a South Korean actress and former singer, as singer she was a former member of Luv, as an actress she is best known for her roles in television dramas My Husband Got a Family (2012), Jang Bo-ri is Here! (2014), Shine or Go Crazy (2015), Come Back Mister (2016), My Sassy Girl (2017), A Korean Odyssey (2017–2018), Love with Flaws (2019–2020), Mad for Each Other (2021) and Café Minamdang (2022).
 

Oh was born in Jinju, South Gyeongsang Province and grew up in Changnyeong County. In the second year of middle school, Oh followed a group of friends to an audition for SM Entertainment, held in Daegu, but was rejected. However, another company contacted her saying that she had qualified and she moved to Seoul, debuting four months later at the age of 15.[citation needed]

Oh was accepted into Anyang Arts High School after her band's disbandment and went on to become an actress. She changed her name from Haet-nim to Yeon-seo after consulting a shaman with her mother.[5]

Oh then entered Dongguk University, joining the theater and film department. ..