Lee Dong-hyuck (born June 6, 2000), better known by his stage name Haechan, is a South Korean singer and performer. He is a member of the boy group and its units , and . He made his debut on July 10, 2016 with the release of NCT 127's first mini album NCT #127 and shortly after debuted in NCT DREAM on August 24, 2016 with the single Chewing Gum.