Park Ye-eun (born May 26, 1989), referred to as Yeeun or Ha:tfelt, is a South Korean singer, songwriter and composer. She debuted in 2007 as a member of the South Korean girl group Wonder Girls. In July 2014, she made her debut as solo artist under name Ha:tfelt with released her solo EP Me?. In early 2017, her group Wonder Girls officially disbanded due to the expired of contract. Following the disbandment, Yeeun signed Amoeba Culture to continue her career as solo artist.

Main article: Wonder Girls

In January 2007, Park was revealed as the fifth member of Wonder Girls. The group officially debuted on MBC's Show! Music Core on February 10, 2007. She composed the songs "Saying I Love You" and "For Wonderful", and performed them live in one of Wonder Girls' US concerts. She also composed "G.N.O (Girl's Night Out)" from their sophomore album and "Wonder World".

Park Ye-Eun at Architecture 101 VIP preview.

In 2012, Park wrote a song for the Korean drama series Dream High 2, which was released on February 14, 2012. She later made a cameo appearance on the drama to perform the song.

2014–present: Solo debut

On July 31, 2014, Park made her debut as solo artist under the pseudonym HA:TFELT (an amalgamation of the words "hot" and "heartfelt;" the British pronunciation of “heartfelt") with debut mini album Me?. The album was included in Billboard's list of the 10 best K-pop albums of 2014.

On January 26, 2017, it was announced that Wonder Girls were to disband after unsuccessful contract renewal negotiations with some of its members, including Yeeun herself, who parted ways with JYP Entertainment. The group released their final single "Draw Me", co-written by Yeeun, on February 10. The song also served as a celebration of the group's 10th anniversary since debut. In April 2017, Park signed with Amoeba Culture, becoming the label's first female solo artist in eleven years.

She subsequently released two soundtrack singles for the Korean travel series Cross Country: "Thru The Sky" and "Cross Country," a collaboration track with Kim Bo-hyung and Suran. In May, Yeeun was credited as a songwriter on "Only You" from former labelmate Twice's EP Signal. On October 12, 2017, Park released her first single, MEiNE ("mine" in German), consisting of two songs: "I Wander" featuring Dynamic Duo's Gaeko and "Read Me" featuring PUNCHNELLO.

On April 18, 2018, Her second single album, Deine ("yours" in German), was released. The single consists of two songs: "Pluhmm" and "Cigar".- Wikipedia