Kao Erh-hsuan, born June 14, 1997, in Muzha, Taipei, is a Taiwanese rapper and singer known professionally as OSN. After a period at a community college in the United States and four months of mandatory military service, OSN returned to Taiwan and met producer Skot Suyama, who shaped his work. He debuted with the single "Everybody Bounce" in 2018, followed by the viral hit "Without You" in 2019, earning a nomination for Song of the Year at the 31st Golden Melody Awards. OSN's first album #osnrap released on April 30, 2019, followed by #OSNRAPII-JOURNEY in 2022. In 2018, he formed the rap group Ching G Squad with three other rappers. His work has charted in Taiwan, and he received the Best New Asian Artist Mandarin award at the 2019 Mnet Asian Music Awards.
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