Lee Dong-hae( Hangul :이동해; Hanja :李東海) (born 15 October 1986) mononymously credited asDonghae( Hangul :동해), is a South Korean Idol singer , dancer , rapper songwriter , promotional model and actor . He is best known as the main dancer, vocal, and rapper of the K-pop boy band Super Junior and its subgroup, Super Junior-M and Donghae & Eunhyuk . He is also one of the first four Korean artists to appear on Chinese postage stamps.