Lee Se-rin (born April 17, 1993), known by the stage name Kasper, is an American singer, rapper, and YouTuber.
She is best known as a contestant of Show Me the Money 4, Unpretty Rapstar 2, and as a former member of co-ed hip-hop group Play the Siren.
[1] In 2014, Kasper joined the urban hip-hop group Play the Siren, which was managed under SM Entertainment's subsidiary indie label Baljunso.
During 2015, Kasper joined Unpretty Rapstar Season 2 where she competed against artists including 4Minute's Jiyoon, Sistar's Hyolyn, Wonder Girls' Yubin, Fiestar's Yezi, as well as YG Trainee Sua and Clover's Gilme.
"[9][10] On January 18, 2017 Kasper made her official solo debut with her single "Lean on Me" under her new label DSP Media.