Lee Hye-ri (born June 9, 1994), better known mononymously as Hyeri, is a South Korean actress, singer, and television personality. She rose to fame as the youngest member of girl group Girl's Day, and was named as the "Nation's Little Sister" by the South Korean media outlets after appearing as a fixed cast member on Real Men (2014). Hyeri later became known as the female lead in Reply 1988 (2015), which was the highest-rated drama in Korean cable television history at the time. After back-to-b...