OYEON, Yang Jin Seok(오연, 양진석) _ black heart(먹먹한 마음)
https://www.youtube.com/watch?v=fVe7nbWcwLQ
https://www.youtube.com/watch?v=fVe7nbWcwLQ
https://www.youtube.com/watch?v=Vc92Fsg3NCE
https://www.youtube.com/watch?v=V-IDVYH3YjA
https://www.youtube.com/watch?v=FLE7AhTkbrs
https://www.youtube.com/watch?v=0HLaNFT8rFo
https://www.youtube.com/watch?v=4zCFlABRM4o
https://www.youtube.com/watch?v=xIJ0hyPMYH0
https://www.youtube.com/watch?v=qkFi6-Ke-sI
https://www.youtube.com/watch?v=IG-F9utrduc
https://www.youtube.com/watch?v=DKnCVCoGL_A