Kim Kyung Rok was discharged from the army back in October of last year and recently showcased his vocals again on KBS 2TV's 'Immortal Song', and this new single expresses how much he missed the stage during his two-year hiatus.

"It's Not a Big Deal" is a medium-tempo soul song created by Rhymer, Master Key, and Shin In Soo with a featuring by Block B's P.O. As the title suggests, the track expresses the feelings of a guy who tries to pretend as if everything is okay after going through a painful breakup. 

The story is portrayed through scenes of web drama 'Aftermath', which stars ZE:A's Dongjun and Sun Joo Ah.

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