VOISPER release their official lyric video for the beautiful track, “Heart” 1theK reveal, The ‘next generation vocal group’ who attracted a lot of attention with great musical abilities,being able sing all genres including R&B song, ballad. This time they are back this fall with heart-aching R&B farewell song ‘Heart’. VOISPER who showed great harmony as ‘North Incheon Nineteen’ on Mnet…