Ko Hyeyeon, known as Hyeyeon (혜연) is a South Korean trainee under NS Entertainment. She is a member and the leader of the upcoming girl group Crescendo
Kang Hye Yeon (강혜연; also known simply as Hyeyeon and formerly known as Dami) is a South Korean singer currently under Star Ent.. She is a former member of the girl groups BESTie and EXID.
