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Park Jae-hyung (Hangul: 박제형; born on September 15, 1992), also known as Jae, is a Korean-American singer, musician, songwriter, and composer. He was the lead guitarist and vocalist for South Korean rock band DAY6 (Hangul: 데이식스) and a major contributor to the composing, songwriting and promoting process. Park departed from the band on December 31st, 2021 due to creative differences with his label, Studio J (A subsidiary of JYP Entertainment.)