Lee Hyukjae was born April 4, 1986 and is better known by his stage name Eunhyuk. He is a singer, dancer, MC, DJ, occasional actor, and a member of Super Junior. He used a stage name due to a conflict with another celebrity. He is talented in areas of both rap and dance, as he is often seen performing solo dances in the group's live performances and music videos. His position in Super Junior is the lead rapper.

In 2000, Eunhyuk auditioned for the Starlight Casting System 2000 and became a trainee of SM Entertainment soon afterwards. Two years later, Eunhyuk, along with Sungmin, childhood friend Xiah Junsu, Typhoon, Rose, and Attack who were placed in one project group, made a brief appearance in a show.  However, in 2003 the group was separated because Xiah Junsu debuted as a member of TVXQ and Typhoon, Rose, and Attack debuted as members of TRAX. Eunhyuk, however, stayed with Sungmin and both of them debuted as members of Super Junior two years later. On November 6, 2005, Eunhyuk officially debuted as a member of Super Junior. Along with Super Junior, Eunhyuk performed their first single.

Eunhyuk has been an active lyricist and wrote rap lyrics for Super Junior's first and second albums. The rap lyrics to "Show Me Your Love" from the winter single between Super Junior and TVXQ was written by him, along with Heechul and Shindong. He also wrote the rap in Super Junior's first CD single "U" and said that it was written for the fans. Thereafter, Eunhyuk became one of Super Junior's main rap lyricists, being a main contributor in the group's rap lyrics for their second album, Don't Don. Eunhyuk is also one of the choreographers for group dances.

Car Addident; On April 19, 2007, Eunhyuk, with fellow members Leeteuk, Shindong, Kyuhyun, and two managers, were involved in a major car accident that had attracted media attention for weeks. Unlike Leeteuk and Kyuhyun, whose injuries were more serious and were kept in the hospital for several months, Eunhyuk and Shindong suffered only minor injuries and were discharged from the hospital on April 23, 2007.