Lightsum’s Profile: Facts, Debut, Birthdays, Pre-Debut, Instagram

lightsum member profile

The Energetic South Korean Girl Group You Should Check Out After (G)I-DLE

LIGHTSUM is a South Korean girl group under Cube Entertainment that contains eight members including Sangah, Hina, Nayoung, Chowon, Juhyeon, Yujeong, Huiyeon, and Jian. This girl group became the second girl group to debut after (G)I-DLE under Cube Entertainment.

They debuted dazzlingly on June 10, 2021, with the single “Vanilla.” Check out the full profile of the LIGHTSUM members and interesting facts here on Channel-Korea! Keep reading!

LIGHTSUM’s Profile

Facebook: LIGHTSUMOfficial
Instagram: cube_lightsum
YouTube: LIGHTSUM Official Youtube Channel
Weibo: Cube_LIGHTSUM

LIGHTSUM’s Member Positions lightsum

1. Sangah: Main Rapper, Lead Dancer

2. Hina: Sub Vocalist

3. Nayoung: Main Vocalist, Lead Dancer

4. Chowon: Main Vocalist

5. Juhyeon: Leader, Main Dancer, Lead Vocalist

6. Yujeong: Sub Vocalist

7. Huiyeon: Sub Vocalist

8. Jian: Sub Vocalist, Rapper, Maknae

LIGHTSUM’s Pre-Debut

The members of LIGHTSUM came from various experiences before joining as a group. Nayoung, Chowon, and Yujeong were joining Produce 48, the famous reality competition show on Mnet. The show was the continuity of Produce 101. It resulted in Nayoung at rank 51, Chowon at rank 13, and Yujeong at rank 51.

Then, Juhyeon even joined another survival show named The Unit: Idol Rebooting Project and gained rank 25. The other members were added since they were trainees for Cube Entertainment.

LIGHTSUM’s Sangah’s Profile

Stage Name: Sangah (상아 / 相雅 / サンア)
Birth Name: Yoon Sang Ah (Hangul: 윤상아)
Hanja Name: Yǐn Xiāng Yǎ (尹相雅)
Position: Main Rapper, Lead Dancer
Birthday: September 4, 2002
Zodiac Sign: Virgo
Chinese Zodiac Sign: Horse
Height: 168 cm (5’6″)
Nationality: Korean

LIGHTSUM’s Sangah’s Fun Facts

1. Sangah was born in Incheon, South Korea.

2. She graduated from Inseong Girls’ High School, A-Root Dance Company, and PinkM Dance Academy.

3. She tends to be into sports since elementary school and collects baseball T-shirts.

4. Sangah passed more than 9 companies of entertainment such as LD, AStory, CJ ENM, Urban Works, J-Planet, Vine, YueHua, JYP, and Source Music.

5. Sangah was the first member revealed to be a member of LIGHTSUM.

6. She has an older brother.

7. Sangah’s life motto is “Don’t get discouraged, and keep your shoulders straight!”

8. She is an easy-going person and is rarely shy in front of people.

LIGHTSUM’s Chowon’s Profile

Stage Name: Chowon (초원 / 霄瑗 / チョウォン)
Birth Name: Han Cho Won (한초원 / ハン・チョウォン)
Hanja Name: Hán Xiāo Yuàn (韓霄瑗)
Position: Main Vocalist
Birthday: September 16, 2002
Zodiac Sign: Virgo
Chinese Zodiac Sign: Horse
Height: 168 cm (5’6″)
Weight: 50 kg (110 lbs)
Blood Type: O
Nationality: Korean

LIGHTSUM’s Chowon’s Fun Facts

lightsum chowon profile

1. She was born in Eunpyeong-gu, Seoul, South Korea,

2. Chowon graduated from Seoul Eungam Elementary School, Chungam Middle School, and Hanlim Entertainment and Arts High School.

3. She joined Produce 48 and got rank 13. Initially, she could have debuted as a lineup member of IZ*ONE, but it was canceled because of the voting scandal.

4. Chowon is Catholic so she has the baptism name Sophia.

5. Chowon was revealed as a third member.

6. Chowon became a friend of DRIPPIN’s Junho.

7. She has some hobbies which are playing the piano and eating.

8. She has skills in composing songs and waacking dance.

9. Her nicknames are Class Monitor, The Black Pearl, Anti-War, Madewa, Reversal Queen, and Cube’s Future.

10. She has a younger brother.

11. She appeared on MBC News in the first grade.

12. Before joining Produce 48, Chowon trained for 1 year and 10 months.

13. She initially wanted to be an actress.

14. She is often teased by members based on TongTong TV interviews.

LIGHTSUM’s Nayoung’s Profile

Stage Name: Nayoung (나영 / 娜英 / ナヨン)
Birth Name: Kim Na Young (김나영 / キム・ナヨン)
Hanja Name: Jīn Nà Yīng (金娜英)
Position: Main Vocalist, Lead Dancer
Birthday: November 30, 2002
Zodiac Sign: Sagittarius
Chinese Zodiac Sign: Horse
Height: 155 cm (5’0″)
Weight: 43 kg (94 lbs)
Blood Type: O
Nationality: Korean

LIGHTSUM’s Nayoun’s Fun Facts

Doc.CUBE Entertainment

1. Nayoun was born in Chuncheon, Gangwon-do, South Korea.

2. Nayoun graduated from Bongui Elementary School, Namchuncheon Girls’ Middle School, and Seoul Performing Arts High School.

3. Nayoun is a former Banana Culture trainee and was part of the trainee group called Newkid.

4. Nayoun became the fifth member revealed as a member of LIGHTSUM.

5. Some of her nicknames are Captain Kawaii, Great Rabbit, and Narongi.

6. She has the ability to do cartwheels and skip rope.

7. She can speak Japanese.

8. Her hobbies include impersonating people, acting, and her personality.

9. She joined Produce 48 and got rank 21.

10. Before joining Produce 48, Nayoun trained for 1 year and 7 months.

11. She joined Cube Entertainment in March 2020.

12. Nayoun was roommates with fromis_9’s Gyuri and FANATICS’s Doah.

13. Nayoun was in episode 10 of SBS’ Bravo My Life and episode 3, season 2 of tvN’s Where Is Mr. Kim.

14. Nayoun succeeded in passing the first round of auditions for FNC, Woollim, and Source Music.

15. Nayoun’s favorite colors are white and yellow.

16. Her life motto is “Easy to get, easy to lose.”

LIGHTSUM’s Hina’s Profile

Stage Name: Hina (히나 / 阳菜 / ヒナ)
Birth Name: Nagai Hina (나가이 히나 / ナガイ ヒナ)
Position: Sub Vocalist
Birthday: April 7, 2003
Zodiac Sign: Aries
Chinese Zodiac Sign: Goat
Height: 158 cm (5’2″)
Weight: 40 kg (88 lbs)
Blood Type: A
Nationality: Japanese

LIGHTSUM’s Hina’s Fun Facts

Doc.CUBE Entertainment

1. Hina has the ability to do ballet.

2. She was attending MARU Dance Studio.

3. She loves mint chocolate Greek yogurt.

4. Hina is the seventh member revealed as a member of LIGHTSUM.

5. She started studying Korean and found some Korean words to be cute.

6. Hina joined the dance academy to sharpen her skills in K-pop dancing, and she learned “Icy” by ITZY.

7. She just says “OK. OK!” if she doesn’t understand some words.

8. Hina likes TWICE so much and even attended a hi-touch event.

9. She dreamed of being a flight attendant when she was a kid like her mother.

10 Hina’s life motto is ”Your efforts will never betray you.”

LIGHTSUM’s Yujeong’s Profile

Stage Name: Yujeong (유정 / 宥姃 / ユジョン)
Birth Name: Lee Yu Jeong (이유정 / イ・ユジョン)
Hanja Name: Lǐ Yòu Zhēng (李宥姃)
Position: Sub Vocalist
Birthday: June 14, 2004
Zodiac Sign: Gemini
Chinese Zodiac Sign: Monkey
Height: 160 cm (5’3″)
Weight: 41 kg (90 lbs)
Blood Type: AB
Nationality: Korean

LIGHTSUM’s Yujeong’s Fun Facts

Doc.CUBE Entertainment

1. Yujeong has talent in musicality.

2. Her hobbies are playing the piano and doing K-pop dances.

3. She was the eighth member revealed as a LIGHTSUM member.

4. She was a cheerleader for 5 years.

5. She graduated from Bongwon Middle School and Seoul Performing Arts High School (Department of Theater and Film).

6. She became a trainee for six months before participating in Produce 48 and getting rank 51.

7. Yujeong is a former trainee of Stardom Entertainment, Fantagio Entertainment, and CNC School.

8. Yujeong is the lazy perfectionist on the team.

9. Yujeong is called The Rabbit based on an interview on TongTong TV.

10. Yujeong’s life motto is “Let’s not make excuses and do our best in everything.”

LIGHTSUM’s Huiyeon’s Profile

Stage Name: Huiyeon (휘연 / 徽姸 / フィヨン)
Birth Name: Oh Hui Yeon (오휘연)
Hanja Name: Wú Huī Yán (吳徽姸)
Position: Sub Vocal
Birthday: August 1, 2005
Zodiac Sign: Leo
Chinese Zodiac Sign: Rooster
Height: 162 cm (5’3”)
Nationality: Korean

LIGHTSUM’s Huiyeon’s Fun Facts

Doc.CUBE Entertainment

1. Huiyeon was educated at Daegu Dalsan Elementary School and Chung-Ang University College of Master’s High School.

2. She has talent in figure skating and has practicEd since elementary school, getting two awards.

3. Huiyeon is the sixth member that was revealed as a member.

4. Huiyeon’s favorite food is rice noodles.

5. She initially trained as an actress under Snowball Entertainment.

6. She passed for some entertainment companies including P-Nation, JYP, Snowball Entertainment.

7. Huiyeon’s life motto is “You gotta do better.”

8. Huiyeon was educated in Def Music Academy and BORN Star Training Center.

9. Huiyeon enjoys eating berries.

10. She loves rice noodles.

11. She has the ability to play the piano.

12. Huiyeon passed the online audition of Cube Entertainment.

13. Huiyeon’s nicknames are Anna, Figure Fairy, Desert Fox, and Squirrel.

14. Her role models are IU, Ariana Grande, and Taylor Swift.

15. Her hobby is watching Netflix, and recently, she watches law school dramas.

16. She has the ability to cook and draw.

17. She doesn’t like sea pineapple and squirrels.

18. She recommends people to listen to the song “Love Affair” by UMI.

LIGHTSUM’s Jian’s Profile

Stage Name: Jian (지안 / 池按 / ジアン)
Birth Name: Kim Ji An (김지안)
Hanja Name: Jīn Chí Àn (金池按)
Position: Sub Vocal, Rapper, Maknae
Birthday: November 4, 2006
Zodiac Sign: Scorpio
Chinese Zodiac Sign: Dog
Height: 166 cm (5’5.5″)
Nationality: Korean

LIGHTSUM’s Jian’s Fun Facts

Doc.CUBE Entertainment

1. Jian is a former JYP trainee.

2. Her role model is Jennie from BLACKPINK.

3. She is a positive person who can make friends easily.

4. She learned taekwondo for two years since kindergarten.

5. Jian was educated at Seoul Beodle Elementary School and Jungshin Girls’ Middle School.

6. Her hobbies are binge-watching idol performances and dramas.

7. Jian’s nickname is Jinyangi (Ji-Cat).

8. Jian is the fourth person revealed as a member of LIGHTSUM.

9. Her life motto is ”Let’s spend days without regret when we look back.”

10. Jian’s vision as a singer is to bring happiness to people.

11. Jian has the ability to play ball games.

12. Jian enjoyed playing police and robbers with her friends when she was a child.

13. She loves singing alone in the practice room while nobody is there.

LIGHTSUM’s Juhyeon’s Profile

Stage Name: Juhyeon (주현 / 珠賢/ジュヒョン)
Birth Name: Lee Ju Hyeon (이주현)
Hanja Name: Lǐ Zhū Xián (李珠贤)
Position: Leader, Main Dancer, Lead Vocalist
Birthday: April 8, 2004
Zodiac Sign: Aries
Chinese Zodiac Sign: Monkey
Height: 171 cm (5’7″)
Weight: 48 kg (104 lbs)
Blood Type: AB
Nationality: Korean

LIGHTSUM’s Juhyeon’s Fun Facts

Doc.CUBE Entertainment

1. Juhyeon was born in Seoul, South Korea.

2. She was educated at Boseong Girls Middle School.

3. She is the second member to be revealed.

4. Her nickname is Robotjju from TongTongTV.

5. She has some hobbies which are watching dramas, going for walks, and listening to music.

6. Juhyeon entered Cube Entertainment in 2014.

7. Her role models are Hyuna and BoA.

8. Juhyeon was a participant in The Unit. She was the youngest one and finished at rank 25.

9. Juhyeon joined the audition of Dancing High and was selected as a participant.

10. She has liked dancing since the second grade.

11. She became a cameo in the MV for PENTAGON’s “Young.”

12. Her life motto is “Let’s not lose me.”


LIGHTSUM was taken from the words “light” and “sum” which mean things that shine small gather together and light up the universe. The group hopes their music can send solid energy with a note of hope.

They debuted on June 10, 2021, with the single “Vanilla” with positive energy like their group’s vision. Check out their MV for “Vanilla” below!

LIGHTSUM’s Instagram

The official Instagram of LIGHTSUM offers the personality, activities, and selfies of the members. Look below!

That is all about LIGHTSUM’s member profiles, fun facts, Instagram, pre-debut, and more. Which one is your bias? Let us know in the comments below. Check out our other articles and share them on your social media, too. Don’t forget to always support LIGHTSUM’s members and their music.