Hyein, South Korean singer

Lee Hye-in, known mononymously as Hyein, is a South Korean singer and former child model. She began her musical career at nine years old as a member of the South Korean children's groups U.sso Girl and Play with Me Club. She later debuted as a member of South Korean girl group NewJeans, formed by ADOR in July 2022.

April 21 is the 111th day of the year in the Gregorian calendar; 254 days remain until the end of the year.