Yoo Seung Woo�revealed a short behind-the-scenes clip of "U Who?", and his unique way of composition has gathered some attention.

CJ E&M�shared that the singer composed most of his upcoming track himself on a smartphone. Rather than using a studio, Yoo Seung Woo recorded melodies he thought of on his smartphone and brought it all together with a producer for the completed "U Who?" track.

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The digital single "U Who?" featuring rapper San E�will be out on October 22. In the meantime, check out the clip above!