Heejin

Jeon Hee-jin (전희진, ; born October 19, 2000), known mononymously as Heejin (occasionally stylized as HeeJin) is a South Korean singer. She is a member of Loona, its sub-unit Loona 1/3, and Artms.

Early life
Jeon Hee-jin was born on October 19, 2000, in Daejeon, South Korea, the youngest of three children with two older sisters. She graduated from Hansung Girls High School in 2019.

2016–2022: Debut with Loona, and Mix Nine
On September 26, 2016, Blockberry Creative announced that Heejin was going to be the first member of their upcoming girl group Loona. As part of the group's pre-debut release strategy, Heejin then went on to release her self-titled single album alongside its single "Vivid" on October 5.

In November 2016, Heejin was featured on the song "I'll Be There" on Loona member Hyunjin's solo debut album. The two also later featured on the song "The Carol", which was released as part of Loona member Haseul's debut single album in December, 2016. In January 2017, Heejin would collaborate once again with Hyunjin for the song "My Sunday" which was released as part of Loona member Yeojin's debut solo album.

On February 14, 2017, Heejin was announced to debut in Loona's first sub-unit Loona 1/3 alongside members Haseul, Hyunjin, and Vivi. They subsequently debuted on March 13 with their mini album Love & Live. In October, Heejin auditioned alongside members Haseul, and Hyunjin for the survival reality show Mix Nine. She passed the audition, and went on as a participant until the final episode, where she finished 4th amongst the female participants.

On March 30, 2018, Heejin featured on the song "Rosy" alongside her members Gowon and Hyeju (also known by her former stage name Olivia Hye), which was part of Olivia Hye's debut single album. Heejin officially debuted with Loona as a full group on August 20, 2018 with the release of their debut EP [+ +].

On November 28, 2022, JTBC Entertainment News reported that nine members of Loona, including Heejin, had filed an application for a provisional injunction to suspend their exclusive contract with Blockberry Creative, following member Chuu's expulsion three days earlier.

2023–present: Solo activities and re-debut with Artms
On January 13, 2023, it was reported that Heejin, alongside Odd Eye Circle members Kim Lip, Jinsoul, and Choerry, had been granted a preliminary injunction against her contract with Blockberry Creative. On March 17, Heejin signed an exclusive contract with Modhaus, an agency founded by Loona's former creative director Jaden Jeong On April 1, Heejin was announced as a member of Artms alongside with other Loona members Kim Lip, Jinsoul, and Choerry. She made her solo debut with the extended play K on October 31.