Cho Kyu-Hyun (born February 3, 1988), best known mononymously as Kyuhyun, is a South Korean pop singer. He is the last member to join the boy band Super Junior. He is the "maknae" (youngest) of the Super Junior members. He is considered one of the four lead vocalists of the group. Kyuhyun is also a member of the Super Junior sub-groups Super Junior K.R.Y. (a ballad group) along with fellow members Ryeowook and Yesung as well as Super Junior- M a group aimed at the Chinese music industry. He was one of the first four Korean artists to appear on Chinese postage stamps. On November 20th 2010, Kyuhyun debuted with fellow SM Entertainment labelmates Jay (from TRAX), Jonghyun (of SHINee) and newcomer Jino in the new ballad group S.M. The Ballad. They released their first mini-album "ë„ˆë¬´ ê·¸ë¦¬ì›Œ" (Miss You) on November 29th, 2010. He is nicknamed "GameKyu" because he likes to play computer games and is very good at it.
Kyuhyun is also close friends with TVXQ's Changmin.