Girl Groups

LOONA 1/3 Members Profile & Facts

LOONA 1/3 members

LOONA 1/3 (이달의 소녀 1/3) members include Heejin, Hyunjin, Haseul, and Vivi. The group  is the first subunit of LOONA that debuted on March 13, 2017, with the EP “Love & Live”.

LOONA 1/3 Profile

DebutMarch 13, 2017
Active Years2017–2023
LOONA 1/3 MembersHeejin, Hyunjin, Haseul, Vivi
GenreDance/ Retro
LabelBlockBerry Creative
Oldest MemberVivi
Youngest MemberHyunjin
Fandom NameOrbits
TypeKpop Girl Group

LOONA 1/3 Facts:

– The subunit is known as LOONA 1/3 or LOOΠΔ 1/3 in English and Japanese. In Korean, the “1/3” part is pronounced as “3/1” (삼분의 일), signifying one-third.
– The group’s music embraces a soft concept centered around the theme of love, exploring both the excitement of first love and the heartache of heartbreak.
– The name “LOONA 1/3” signifies that it consists of 1/3 of the entire LOONA members.
– LOONA 1/3 members represent different locations in the unit’s individual concepts, and their interactions create a story in the LOONAVERSE.
– Yeojin was initially revealed as the “slash” in 1/3, but she is not a member of the unit itself.
– The group is the only unit in LOONA with four official members and one unofficial member.
– LOONA 1/3 members were revealed in the following order: Heejin – Hyunjin – Haseul – Vivi.
– A reissue of their extended play ‘Love & Live,’ named Love & Evil, was launched on April 27, 2017. This reissue featured two additional tracks and introduced a new lead single, “Sonatine.”
– The group’s production reportedly amounted to 4 million dollars, including filming their title track’s music video in New Zealand and Hong Kong.
– In the LOONAVERSE, Heejin encounters Hyunjin, who attends the same school and shares the same grade. Haseul acts as a nurturing figure similar to a mother for Yeojin. Vivi, an android with limited Korean proficiency, crosses paths with Jinsoul in Hong Kong.
– LOONA 1/3 is the only sub-unit of LOONA with a foreign member.
– During Haseul’s hiatus, Heejin suggested shortening the name to “Third” since Haseul is the “One” in “One-Third.”
– Their name also holds another meaning when flipped to “3 / 1,” representing the sequence of LOONA 1/3 members introductions.
– This is the only subunit of LOONA where the leader was not revealed first.


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Streaming Platform Links
Genie | Spotify | Bugs | Melon | Apple Music | Deezer

Loona 1/3 Members Profile

1. Haseul

Haseul Loona 1/3
Stage NameHaseul (하슬)
Birth NameCho Haseul (조하슬)
PositionLeader, Main Vocalist
BirthdayAugust 18, 1997
Active Years2016–present
Age26 years old (in Aug 2023)
Zodiac SignLeo
Height159 cm (5’2″)
Weight45 kg (99 lbs)
Blood TypeO

Haseul Facts:

– She has a makeup license.
– Haseul was the first LOONA member to acquire a driver’s license.
– Her MBTI was revealed at the last among LOONA 1/3 members.
– She and Jinsoul are known as Tom & Jerry.
– She’s a fan of Taylor Swift and especially likes the song “I Knew You Were Trouble.”
– She likes short hair over long hair.
– She prefers winter over summer due to reduced face swelling.
– Out of all LOONA 1/3 members, Haseul and Vivi are known to have the most gentle nature.
– She enjoys watching the movie Sherk.
– Her favorite Subway Pick is Eggma.
– She loves eating avocado.
– “Pistachio Almond” is her favorite ice cream flavor at Baskin Robbins.
– She is clumsy and often spills things on her clothing.
– She is scared of watching horror movies.
– Haseul was the third to be revealed among LOONA 1/3 members.
Read more facts about Haseul


Streaming Platform Links
Genie | Spotify | Bugs | Melon | Apple Music

2. Vivi

Vivi Loona 1/3
Stage NameVivi (비비)
Birth NameWong Kahei (黃嘉熙)
PositionLead Dancer, Vocalist
BirthdayDecember 9, 1996
Active Years2016–present
Age27 years old (in Jan 2023)
Zodiac SignSagittarius
Height160 cm (5’2″)
Weight42 kg (92 lbs)
Blood TypeO

Vivi Facts:

– Vivi attended Hong Kong Catholic Mingyuan Secondary School.
– She loves traveling.
– She likes taking walks and visiting the sea.
– She recommends Tsim Sha Tsui as a must-visit spot in Hong Kong.
– She prefers both long and short hairstyles.
– She often changes her hair color.
– She likes to cook.
– Vivi was the last to be revealed out of all LOONA 1/3 members.
– She was a trainee for a year.
– She enjoys watching scary and horror movies.
– Her favorite anime is One Piece and she loves Nami.
– She is a cat person.
– She loves to eat cakes and her favorite cake is chocolate cake.
– She does not like eating mint chocolate.
– She considers herself proficient in drawing.
– Among LOONA 1/3 members, Vivi and Haseul are known as the most kind and gentle.
Read more facts about Vivi


Streaming Platform Links
Genie | Spotify | Bugs | Melon | Apple Music | Deezer

3. Heejin

Heejin Loona 1/3
Stage NameHeejin (희진)
Birth NameJeon Heejin (전희진)
PositionMain Dancer, Lead Vocalist, Visual, Center
BirthdayOctober 19, 2000
Active Years2017–present
Age23 years old (in Jan 2023)
Zodiac SignLibra
Height161.2 cm (5’2″)
Weight46 kg (101 lbs)
Blood TypeA

Heejin Facts:

– She once held a plank position for as long as 9 minutes.
– Since her high school freshman year, Heejin has been a fan of Americano coffee and often bought it before going to school with Hyunjin.
– She’s called “Dangun” due to being the first LOONA member to debut.
– Her personal remedy for relaxation is lying in bed and playing games with the air conditioning on.
– Heejin was the first to be revealed among LOONA 1/3 members.
– She prefers phone calls over texting.
– Given a choice, she’d rather wear wet socks in the rain than opt for new shoes.
– She feels more confident in her charismatic gaze than in smiling eyes.
– She’d pick a lifelong summer over a lifelong winter.
– She likes eating soft peaches.
– She prefers bone chicken.
– She enjoys eating vegan food.
– She is not very good at cooking.
– She is not easily angered.
– She loves dancing to boy group choreographies.
– Summer is her favorite season.
– Out of all LOONA 1/3 members, Heejin is best friends with Hyunjin.
Read more facts about Heejin


Streaming Platform Links
Genie | Spotify | Bugs | Apple Music | Deezer

4. Hyunjin

Hyunjin Loona 1/3
Stage NameHyunjin (현진)
Birth NameKim Hyunjin (김현진)
PositionLead Dancer, Lead Vocalist, Visual, Maknae
BirthdayNovember 15, 2000
Active Years2016–present
Age23 years old (in Nov 2023)
Zodiac SignScorpio
Height163 cm (5’3″)
Weight47 kg (103 lbs)
Blood TypeAB

Hyunjin Facts:

– Hyunjin enjoys traveling and walking alone.
– Among the participants of MixNine, she reportedly had the most secret late-night snacks, as per Yang Hyun-suk’s statement.
– Gong Hyo-jin is her role model.
– During middle school, she was rumored to be popular as a trainee at Polaris Entertainment.
– Hyunjin was the third to be revealed among LOONA 1/3 members.
– She was almost part of the South Korean drama “Seonam Girls’ High School Detectives.” While her original role was dropped, the director proposed a different role that her agency declined, leading to the cancellation of her appearance.
– She is of Pagan religion.
– Due to her long arms, she often acts as a makeshift selfie stick during V LIVE sessions.
– She loves ballads.
– Coffee is her favorite beverage and she likes drinking hot coffee over cold coffee.
– She covers her mouth with her hand out of habit.
– Hyunjin is the youngest among all LOONA 1/3 members.
Read more facts about Hyunjin


Streaming Platform Links
Genie | Spotify | Bugs | Melon | Apple Music | Deezer


1. What is LOONA 1/3 called in Korean?

LOONA 1/3 is called “Idalui Sonyeo Sambunui Il” (이달의 소녀 삼분일) which translates to “Girl of the Month One Third” in English.

2. How old are the LOONA 1/3 members? (oldest to youngest)

LOONA 1/3 members’ ages and birthdays are as follows:

– Vivi was born on December 9, 1996, and is 27 years old.
– Haseul was born on August 18, 1997, and is 26 years old.
– Heejin was born on October 19, 2000, and is 23 years old.
– Hyunjin was born on November 15, 2000, and is 23 years old.

LOONA 1/3 members were of the following ages when they debuted in 2017: Vivi was 20, Haseul was 19, Heejin was 16 and Hyunjin was 16 years old.

3. How tall are the LOONA 1/3 members? (tallest to shortest)

LOONA 1/3 members’ heights are the following from tallest to shortest:

– Hyunjin’s height is 163 cm (5’3″).
– Heejin’s height is 161.2 cm (5’2″).
– Vivi’s height is 160 cm (5’2″).
– Haseul’s height is 159 cm (5’2″).

Hyunjin is the tallest member in LOONA 1/3 and Haseul is the shortest.

4. Where are the LOONA 1/3 members from? (ethnicity & nationality)

LOONA 1/3 members’ nationality & ethnicity are as follows:

– Hyunjin is South Korean by ethnicity and nationality.
– Vivi is Chinese by ethnicity and nationality.
– Heejin is South Korean by ethnicity and nationality.
– Haseul is South Korean by ethnicity and nationality.

All LOONA 1/3 members are from South Korea except for Vivi who is Chinese.

5. What are the official positions of LOONA 1/3 members?

Following are the official LOONA 1/3 members’ positions:

– Haseul is the Leader and Main Vocalist.
– Vivi is the Lead Dancer and Vocalist.
– Heejin is the Main Dancer, Lead Vocalist, Visual, and Center.
– Hyunjin is the Lead Dancer, Lead Vocalist, Visual, and Maknae.

NOTE: If you know more facts about Loona 1/3 members, feel free to submit them in the comments section! All submissions will be greatly appreciated!

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Lilian Chen

Yo! I'm Lilian, an Ahgase and a curious wordsmith on a never-ending quest for knowledge. Don't hesitate to spot any slip-ups in my work and feel free to reach out with additional facts & insights! ^^

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