Yoon Jin-seo (born Yoon Soo-kyung, 5 August 1983) is a South Korean actress. Yoon has starred in films such as Old Boy, All for Love, A Good Day to Have an Affair, and Secret Love. She also appeared in a variety of TV series — historical drama The Return of Iljimae, action comedy The Fugitive: Plan B, and cable romantic comedy Twelve Men in a Year.
Yoon was a contributing writer at Movie week magazine, writing 11 articles over the period of 2010 to 2011 under the column 윤진서의 롤링 페이퍼 (“Yoon Jin-seo’s Rolling Paper”).
In November 2012, Lee signed on to be exclusively managed by FNC Entertainment.