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.)
He is currently managed by Reynolds Management and opened for Imagine Dragons' LOOM tour in 2024.

He has been releasing solo music under the name eaJ since 2020 and officially made his solo debut on April 08, 2022 with the release of the single 'Car Crash'. His older work under the eaJ project can be found on Soundcloud and Youtube. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.