Jeong Yun-hui (born June 4, 1954) is a South Korean actress active since 1975. She was born in Tongyeong, a southwestern coastal city of South Gyeongsang province, South Korea in 1954. After graduation from Hyehwa Girls' High School, Jeong debuted as an actress in 1975 as starring in Yokmang directed by Lee Gyeong-tae. Jeong was commonly referred to as one of the "New Troika" or "Second Troika" along with her rival actresses, Chang Mi-hee and Yu Ji-in of the 1970s and 1980s after the "First Troika", Moon Hee, Nam Jeong-im, and Yoon Jeong-hee of the 1960s.