Serine Lee, commonly known as Kasper (hangul: 캐스퍼) is a South Korean rapper and YouTuber. She used to be a member of rap group Play the Siren. In January of 2017, she made her long-awaited official debut as a solo artist under DSP Entertainment with the song Lean On Me. Prior to debut, Kasper gained recognition for her rapping on her soundcloud, as well as appearances on Show Me The Money and Unpretty Rapstar.