Lee Sun-mi (born May 2, 1992), referred to as Sunmi, is a South Korean singer. She debuted in 2007 as a member of South Korean girl group Wonder Girls and left the group in January 2010 to pursue her academic career.

After three years hiatus from music scene, Sunmi resumed her career as a soloist in August 2013 with her first digital single, "24 Hours". It peaked at number two on South Korea's Gaon Digital Chart and number three on Billboard's Korea K-pop Hot 100. Her debut extended play, Full Moon (2014), charted at number twelve and its lead single charted at number two on South Korea's Gaon Digital Chart and number three on Billboard's Korea K-pop Hot 100, also charted at number thirteen on Billboard World Digital Chart.

In 2015, Wonder Girls returned to music scene after two years hiatus with band formation and Sunmi also confirmed to re-joining the group after departure in 2010. The group later disbanded in 2017 after Sunmi and Yeeun decided to not renew their contracts with JYP Entertainment.