Yoo Chae-yeong (born September 22, 1977) is a South Korean singer and actress. She debuted at the age of 17 and was a former member K-Pop group Cool. Because she sported a shaved head, the group received much attention from the media. After their first album, Yoo Chae-yeong was replaced by Yuri as the vocalist. Emotion was popular in China after her movie Sex Is Zero. She is lingering long in memories of the Chinese as a dance singer with alluring voice. She was back with her first single album, Another Decade in 2009 after 10 years' absence.