Wheesung ft. G.Gorilla - Rain Drop [Han & Eng]

Song: Rain Drop
Artists: Wheesung ft. G.Gorilla
OST: Why Did You Come to My House
I looked up G.Gorilla but I still don't know how he is in this song. Is he playing an instrument or he is a very quiet background vocal that I am too deaf to hear? Enjoy!
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DISCLAIMER: This video is made to spread and teach the beautiful Korean language through the wonderfully written and composed music. No profit is made from this video. All rights go to the respective owners.