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LIGHTSUM Member Ages and Birthdays
South Korea · Official roster: 6 (6 birthdays recorded)
LIGHTSUM members from oldest to youngest: SANGAH (24), CHOWON (24), NAYOUNG (23), HINA (23), JUHYEON (22), YUJEONG (22). The oldest is SANGAH, born September 4, 2002; the youngest is YUJEONG, born June 14, 2004.
Debut date: Next debut anniversary: June 10
Fandom name: SUMIT (썸잇)
Members with a nationality other than South Korea: HINA (Japan)
Sources for debut date / leader: LIGHTSUM JAPAN OFFICIAL FANCLUB site – PROFILE
Sources for support color / lightstick / fandom name: LIGHTSUM JAPAN OFFICIAL FANCLUB site – PROFILE (verified October 21, 2026)
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Exports 6 recorded birthdays on this page, repeating yearly. This file does not update automatically; download and import it again after corrections. Set reminders in your calendar app.
Birthdays of all members
| Birthday | Member | Other spellings |
|---|---|---|
| September 4 | SANGAH 尹相雅상아윤상아サンアYoon Sang Ah | 相雅 |
| September 16 | CHOWON 韓霄瑗초원한초원チョウォンHan Cho Won | 霄瑗 |
| November 30 | NAYOUNG 金娜英나영ナヨンKim Na Young | 娜英 |
| April 7 | HINA 長井陽菜히나ヒナNagai Hina | 陽菜 |
| April 8 | JUHYEON 李珠賢주현ジュヒョンLee Ju Hyeon | 珠賢 |
| June 14 | YUJEONG 李宥姃유정ユジョンLee Yu Jeong | 宥姃 |
Roster source: LIGHTSUM JAPAN OFFICIAL FANCLUB PROFILE (licensed by CUBE, operated by STARRY) (retrieved August 28, 2026)
Age ranking of members (oldest to youngest)
We have full birth dates for 6 of 6 members (members with only a birth month and day are left out, since their age can’t be calculated). Ages update to today’s date.
| Rank | Member | Birthday | Age | Age at debut |
|---|---|---|---|---|
| 1 | SANGAH | September 4, 2002 | 24 | 18 |
| 2 | CHOWON | September 16, 2002 | 24 | 18 |
| 3 | NAYOUNG | November 30, 2002 | 23 | 18 |
| 4 | HINA | April 7, 2003 | 23 | 18 |
| 5 | JUHYEON | April 8, 2004 | 22 | 17 |
| 6 | YUJEONG | June 14, 2004 | 22 | 16 |
Ages here are international ages (counted from the date of birth), the system South Korea has also used officially since June 2023, not “Korean age”.
LIGHTSUM Members’ Zodiac Signs
Only members with a known birthday are included. Sign boundaries: zodiac index
This page lists all 6 members on LIGHTSUM’s official roster. 6 of them have their own page on this site (our inclusion rule: someone has held a support event for them, or a verifiable identity or birthday source exists). The rest are marked “roster only” and appear only in this table. Birthdays are listed only when we find a verifiable source; otherwise they’re marked “no verifiable source found.” We never fill gaps with guesses. Spotted an error, or have a verifiable official source? Email service@joelin.cc. (email us a report)
Fan Events
Events posted by fans show up here as soon as they’re published. Whether an event is also featured on the home page is a separate pick by Joe and has nothing to do with this list.
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Group support usually centers on debut anniversaries and concerts. Each member’s birthday is in the table above.
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FAQ
- What are the birthdays of LIGHTSUM's members?
- LIGHTSUM’s official roster has 6 members. Those with a verifiable birthday on this site: SANGAH September 4, CHOWON September 16, NAYOUNG November 30, HINA April 7, JUHYEON April 8, YUJEONG June 14. Each birthday’s source is cited on this page and on the person’s own page.
- How many LIGHTSUM members are listed on this site?
- LIGHTSUM: Official roster: 6. Of these, 6 have a verifiable birthday recorded on this site. This page lists all 6 members on LIGHTSUM’s official roster. 6 of them have their own page on this site (our inclusion rule: someone has held a support event for them, or a verifiable identity or birthday source exists). The rest are marked “roster only” and appear only in this table. Birthdays are listed only when we find a verifiable source; otherwise they’re marked “no verifiable source found.” We never fill gaps with guesses. Spotted an error, or have a verifiable official source? Email service@joelin.cc.
- When was LIGHTSUM’s debut?
- LIGHTSUM's debut date is June 10, 2021, so every year on June 10 marks the debut anniversary. In other words, LIGHTSUM’s debut year is 2021. The debut anniversary is one of the most common occasions for group fan support.
- What nationalities are the members of LIGHTSUM?
- On this site, the LIGHTSUM members recorded with a nationality other than South Korea are: HINA (Japan).
- What is LIGHTSUM's fandom name?
- LIGHTSUM's official fandom name is SUMIT (썸잇). We only list details backed by an official source; anything we can’t verify is left out. Sources are cited at the bottom of this page.
- What is the age order of LIGHTSUM's members? Who is the oldest?
- We have birth years for 6 of 6 LIGHTSUM members (members with only a birth month and day can’t be ranked by age). Ordered from oldest to youngest: SANGAH (born September 4, 2002), CHOWON (born September 16, 2002), NAYOUNG (born November 30, 2002), HINA (born April 7, 2003), JUHYEON (born April 8, 2004), YUJEONG (born June 14, 2004). The oldest is SANGAH, and the youngest is YUJEONG.
- What are the zodiac signs of LIGHTSUM’s members?
- Based on their birthdays: Aries: HINA, JUHYEON; Gemini: YUJEONG; Virgo: SANGAH, CHOWON; Sagittarius: NAYOUNG. Signs use the month and day only, with the boundary dates explained on our zodiac pages.