ユク・ソンジェ（BTOB）、収録中に下着の色を確認…「パール混じりのブラック」＝（シングル男のハッピーライフ）
Yook Sung Jae checks the color of his underwear while recording... ”Black with pearls” = (Single man's happy life)
Yook Sung Jae (BTOB) checked the color of his underwear while recording in the studio.
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