Kim Hyo-yeon (born September 22, 1989), better known mononymously as Hyoyeon, is a South Korean singer and television personality. She debuted as a member of girl group Girls' Generation in August 2007, who went on to be one of the best-selling artists in South Korea and one of South Korea’s most popular girl groups worldwide.

Later in June 2016, Hyoyeon was featured in the song “Up & Down” from fellow Girls' Generation member Taeyeon’s second mini-album Why. In August 2016, she collaborated with miss A member Min and 2AM member Jo Kwon to form a special group named Triple T and release a single titled “Born to Be Wild”, featuring Park Jin-young, as part of S.M. Entertainment’s Station music project.

In December 2016, Hyoyeon released her first solo song since debut titled “Mystery” as another single for SM Station. To accompany her solo release, she performed the song on various Korean music shows and starred in her reality show, Hyoyeon’s 10 Million Likes 2.

In June 2017, Hyoyeon released her second single “Wannabe”, a pop dance song featuring rapper San E