Kao Erh-hsuan (Chinese: 高爾宣; pinyin: Gāo Ěrxuān; born June 14, 1997), better known by his stage name OSN, is a Taiwanese rapper and singer. Gao's music is characterized by his sentimental hip hop style and use of both Mandarin and English lyrics.[1][2] Gao is represented by SKR Presents, a record label by music producer Skot Suyama [zh].
After serving his four-month mandatory military service, Gao met Skot Suyama, who helped produce his future songs. In 2018, Gao debuted with first song, "Everybody Bounce".[6] His 2019 song, "Without You", was a viral hit in Taiwan and was nominated for Song of the Year at the 31st Golden Melody Awards.[7][8][9] On April 30, 2019, Gao released his debut album titled #osnrap.[10] That same year, he won the Best New Asian Artist Mandarin award at the Mnet Asian Music Awards.[11]
Besides his solo career, in 2018, Gao formed the rap group Ching G Squad with three other rappers: Shou, Red, and ChrisFlow. The group released their first extended play, Watermelon, on September 20, 2019.[12]