Jung Ye In (정예인) is the former Lead Dancer, Main Vocalist, and Maknae of the girl group Lovelyz under Woollim Entertainment. Yein became a Woollim trainee on 2014, just a few months before Lovelyz debuted.
Lovelyz debuted on November 17, 2014 with the album "Girls' Invasion".
On November 1, 2021 Woollim Entertainment announced that Lovelyz had disbanded. On January 11, 2022, it was announced that she has signed an exclusive contract with Sublime Artist Agency to promote as a solo artist. Yein made her solo debut with "Plus n Minus" on January 25, 2022.