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 Yeon-seo made her entertainment debut in 2002 when she was 15-years-old under her birth name Oh Haet-nim, with the SidusHQ-managed band Luv. They released their first album, Story, with the singles "Orange Girl" and "I Still Believe in You".[7] The band was short-lived and disbanded six months later. Oh then shifted to acting and made her debut appearance in the 2003 drama Sharp, but remained unknown.[8]
In 2013, Oh played a thoracic resident surgeon in medical drama Medical Top Team.[14][15] She was appointed an ambassador for the first annual Animal Film Festival in Suncheon along with Kim Min-jun and Kal So-won to help raise awareness for animal rights and welfare in August.[16] Oh was also appointed a Red Cross Ambassador together with actor Ryu Soo-young.[17]
2014–present: Breakthrough
Oh played the lead role of Jang Bo-ri, a compassionate and selfless person, in the highly acclaimed series Jang Bo-ri is Here! (2014). The drama's ratings peaked at 40.4%, and led to a surge in popularity for Oh. She had a hard time playing the character as she grew up in Gyeongsang-do but her character had to speak the Jeolla-do dialect, which she had never used in her entire life.[18]
In 2015, Oh played Shin Yool, the last princess of Balhae, in the historical drama Shine or Go Crazy, co-starring Jang Hyuk.[19][20] The series was a modest hit, and topped ratings in its timeslot throughout its run.[21]
Oh then starred alongside Rain in the SBS drama Come Back Mister, which aired from February to April 2016. She played Han Hong-nan, a male character reincarnated in a female's body. Oh was praised for her chemistry with co-star Lee Ha-nui, whom she has acted with in her previous project Shine or Go Crazy.[22] She also impressed viewers through her comedic portrayal of her masculine role.[23] The same year, she starred in Take Off 2, the sequel to the 2009 movie Take Off where she plays a member of the first South Korean woman's national ice hockey team.[24]
In 2021, Oh was cast in the web drama Mad for Each Other which premiered on May 24 alongside Jung Woo.[32] Later in November 2021, Oh officially signed with Story J Company.[33]
On March 29, 2018, it was confirmed that Oh is in a relationship with actor Kim Bum.[36][37][38] However, after a few months of dating they were reported to have parted ways.[39][40]
^"스토리제이컴퍼니". Story J Company. Retrieved March 19, 2024.
^남은경 (June 2, 2008). "흐르는 강물처럼 성장하고 싶은 배우, 오연서". Movieweek (in Korean). Archived from the original on December 22, 2015. Retrieved November 21, 2022 – via CastNet.
^오연서-전혜빈, 걸그룹 러브 데뷔곡 '오렌지걸' 무대 재현 "상큼" [Oh Yeon-seo - Jeon Hye-bin, girl group LUV makes a 'refreshing' reappearance on stage with debut song 'Orange Girl']. The Dong-a Ilbo (in Korean). September 19, 2009. Archived from the original on November 25, 2014. Retrieved November 13, 2014.
^Jung Yu-jin (November 3, 2021). "오연서, 스토리제이컴퍼니와 전속계약...김태희‧김정현‧고수 한솥밥[공식]" [Oh Yeon-seo, an exclusive contract with Story J Company... Kim Tae-hee, Kim Jeong-hyeon, Gosu One Pot Rice [Official]] (in Korean). Spotify News. Archived from the original on April 9, 2023. Retrieved November 3, 2021 – via Naver.
^Kim, Na-ra (November 14, 2022). "'압꾸정' 마동석X정경호→오연서, 자양강장제 케미" ['Apkkoojeong' Ma Dong-seok X Jung Kyung-ho → Oh Yeon-seo, tonic chemistry]. My Daily (in Korean). Archived from the original on November 15, 2022. Retrieved November 15, 2022 – via Naver.
^"'돌아온 뚝배기' 오연서, CF모델상 수상". Sports Khan (in Korean). January 13, 2009. Archived from the original on April 7, 2023. Retrieved January 11, 2019.
^Moon Ji-yeon (July 6, 2022). "제1회 청룡시리즈어워즈 후보 공개..'오징어 게임'·'SNL코리아' 최다노미" [The 1st Blue Dragon Series Awards nominees revealed.. Most Nominees for 'Squid Game' and 'SNL Korea'] (in Korean). Sports Chosun. Archived from the original on November 12, 2020. Retrieved July 6, 2022 – via Naver.
^Hwang, Soo-yeon (January 1, 2023). "붉은 단심' 3번 거절했는데..." 이준·강한나·이혜리, 미니시리즈 우수상 [KBS 연기대상]" [Single Heart Red' was rejected 3 times..." Lee Joon·Hanna Kang·Hyeri Lee, Miniseries Excellence Award [KBS Drama Awards]] (in Korean). X-ports News. Archived from the original on January 1, 2023. Retrieved January 1, 2023 – via Naver.
^Hwang Soo-yeon (January 1, 2023). "이승기 "커플상 혼자라 씁쓸"→강하늘♥하지원, 베스트커플상 [KBS 연기대상]" [Lee Seung-gi "It's bittersweet to be alone as a couple" → Kang Ha-neul ♥ Ha Ji-won, Best Couple Award [KBS Drama Awards]]. Xports News (in Korean). Naver. Archived from the original on December 31, 2022. Retrieved January 1, 2023.