Lee Hye-ri (Hangul: 이혜리; born June 9, 1994), better known mononymously as Hyeri, is a South Korean singer, actress, and television personality. She rose to fame as the youngest member of the girl group Girl's Day and was named as the "Nation's Little Sister" by the South Korean media due to her immense popularity after appearing as a fixed cast member on Real Men (2014). She later became known for her leading role in television drama Reply 1988 (2015), which was the highest-rated drama in Korean cable television history at the time. She ranked third in the Forbes Korea Power Celebrity list in 2016 and is one of the highest-paid commercial models in South Korea. She was a regular cast member on Amazing Saturday (2018-2020).