Sugar (슈가) was a South Korean K-pop girl group that debuted on December 18th, 2001 with their song "Sweet Love", under SM Entertainment. The group consisted of 5 members: Ayumi Lee, Lee Ha-Rin, Hye Seung, Hwang Jung-Eum, and Park Soo-Jin.
Sugar entered the Japanese music market after their second Korean album. The group debuted with two songs that were used as the soundtrack of the anime, Kaleido Star. After the group released their third Japanese single, Hwang Jung-Eum decided to leave the group and pursue a solo career in the entertainment industry. Soon after her departure, she was replaced by a new member, Lee Harin.
In 2005, Sugar released a Korean album which marked their return to Korean Music after Japanese activities. The same year, while releasing their second album in Japan, "COLORS 4 WISHES", Member Park Soo-Jin announced that she would be leaving the group to pursue an acting career after concluding the group's album promotions.
In July 2006, Ayumi Lee debuted as a soloist but remained within the group. Sugar went into a hiatus and reported that a new member would replace former member Park Soo-Jin. In November, Ayumi Lee continued her solo career and no new announcements were made.
On December 20th, 2006, all the member's contracts have expired. KBS World Radio announced that Sugar officially disbanded with a statement that each of the members wanted to embark on solo careers, and SM Entertainment decided not to renew their contracts with the members. However, the group's other music label, Star World, revealed the future plans of the members once Sugar disbanded.