- HeeHyun (Hee/Jin and Hyun/Jin)
- Both were born in 2000.
- Both were born in South Korea.
- Both have brown eyes.
- Both have brown hair.
- Both were revealed as members in 2016.
- Both are part of the sub-unit LOONA 1/3.
- Both of their representative are mammals: Rabbit (HeeJin) and Cat (HyunJin).
- Both participated in the survival show MIXNINE.
- Both have two siblings.
- Both attend Hansung Women's High School.
- Both are confident in their dancing abilities.
- HyunJin's blood type is AB while HeeJin's is A.
- HyunJin can play the piano, while HeeJin can play the guitar.
- They are in the group LOONA.
- They dorm together, along with the rest of the members of LOONA 1/3.