Kim Kyung Rok of V.O.S. (Voice of Soul) unveils “It’s Not A Big Deal” music video featuring the scenes from the online drama, “Aftermath.” The drama happens to star ZE:A’s Dongjun and Sun Joo Ah. “It’s Not A Big Deal” is a mid-tempo track which highlights the singer’s soulful vocals. The track also feature’s Block B’s P.O. Check out the…