SM 콘서트에서 불러 화제가 된 백현 x 희철의 '나비잠' "그걸 왜 둘이 불러" 질투 폭발한 나비잠 원년 멤버 경훈! 질투 폭발해 백현 x 희철 듀엣에 합류한 경훈의 특급 콜라보! [아는 형님]에서만 들을 수 있는 백현 x 희철 x 경훈 '나비잠'♪ Please enter subtitle of this video in your own language. Anybody can enter subtitle by referring to existing English subtitle. You can make viewers all over the world pleased with your subtitle. Please click below link if you are interested in participating with subtitle. JTBC Youtube channel communicating with fans faster View more videos & informations ☞ ▶ official : http://www.jtbc.co.kr ▶ youtube : http://www.youtube.com/jtbcentertainment ▶ facebook : https://www.facebook.com/JTBClove ▶ twitter : https://twitter.com/jtbclove