[1] Jeon Hee-jin was born on October 19, 2000, in Daejeon, South Korea, the youngest of three children with two older sisters.

[5] 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.

[6] 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.

[8] In October, Heejin auditioned alongside members Haseul, and Hyunjin for the survival reality show Mix Nine.

[13] 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.