Ko So-young (Korean: 고소영; born October 6, 1972) is a South Korean actress and model.^[2]

Ko was born in Seoul, South Korea. She attended an all-female high school before gaining early admission to Chung-Ang University, where she studied computer science.

Ko debuted in the TV drama Love Tomorrow in 1993 and quickly established herself as a representative star of her generation. She made her film debut opposite Jung Woo-sung in The Fox with Nine Tails in 1994, which was the first Korean film to use computer-generated imagery. However, it failed to make an impression on audiences or critics.^{[citation needed]} Ko first achieved wide recognition through her role in Beat (again with Jung Woo-sung), a film that caught the imagination of many South Korean high school students.^[3] Since then she has acted in a series of successful melodramas, portraying a young model in If the Sun Rises in the West, a Jeju Island tour guide in Love Wind Love Song, and a Korean American adoptee in Love.

In 2001, Ko teamed up with actor Lee Sung-jae in A Day, about a married couple who have trouble conceiving a child. Her acting in the film was much praised and garnered the Best Actress prize from the local Grand Bell Awards ceremony.^[4] Then, after two years off, Ko returned in 2003 opposite Han Suk-kyu in the spy thriller Double Agent; however, the film failed to live up to the expectations of most viewers and critics. She then shot two films in 2006: the horror film APT by director Ahn Byeong-ki, and the romantic comedy Project Makeover by debut director Jeon Young-gap. After two commercial flops in 2007 with Project Makeover and the SBS drama Blue Fish, Ko went into a hiatus.

A decade after her last appearance, Ko made a comeback with the KBS drama Ms. Perfect.^[5]

Ko married actor Jang Dong-gun in a star-studded wedding ceremony held at Seoul's Shilla Hotel on May 2, 2010, while five months pregnant. The couple's first child, a son Jang Min-joon, was born on October 4, 2010.^{[6][7][8][9][10]} Their second child, a daughter, was born on February 25, 2014.^[11][12]