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In 2011, Eunhyuk, along with Sungmin was placed two new members of Super Junior-M.
In 2002, Eunhyuk, Kim Junsu, and another trainee Sungmin were placed in a project R&B group.
The group consisted of him and his childhood friends Kim Junsu, Hwang Tae Jun, and Choi Min Seok.
The crew's popularity prospered in their hometown; and when SRD appeared in a local newspaper, it was then that Eunhyuk cemented his dream to become a singer/performer.
With the exception of four months from March to June 2011, where bandmate Yesung temporarily replaced Eunhyuk, while he was away on promotional activities for Super Junior-M's third EP Perfection.
In February 2007, Eunhyuk was placed in the trot-singing sub group Super Junior-T and released the single Rokkugo.