List of Female Rappers and Singers Who Become Successful After Their Appearance on ‘Unpretty Rapstar’


Lee Se-rin, better known by the stage name Kasper, is a South Korean rapper, singer, and YouTuber. She is best known as a contestant on Show Me the Money 4, Unpretty Rapstar 2, and as a former member of co-ed hip-hop group Play the Siren. She debuted as a solo artist with her debut single, “Lean on Me”, in January 2017.


Kasper started the YouTube channel “KASPER 캐스퍼” on February 9, 2010. In 2014, Kasper joined the urban hip-hop group Play the Siren, which was managed under SM Entertainment’s subsidiary indie label, Baljunso. They debuted with the song “Dream Drive”, featuring f(x)’s Luna in July 2014. During 2015, the group disbanded. Kasper was the final one to leave after the group and stood around Balijunso until 2016.

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. Kasper was eliminated in episode 8, alongside Cosmic Girls’ Exy.

In 2016, she signed a contract with DSP Media. On January 18, 2017, Kasper made her official solo debut with her single “Lean on Me” under her new label, DSP Media. Her video came out after the release on DSP Media’s YouTube channel.

In August 2018, Kasper released her first mini-album, titled Time is Up. The music video of her album’s title track “Cloud” was released on August 8, 2018. 

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