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CompanyWake One Entertainment
Year Debut2022
Year Active2
Year DisbandedN/A

Not Ranked



Kep1er (케플러; pronounced kepler) is a nine-member South Korean girl group formed through the survival show Girls Planet 999. Kep1er is a temporary group. They debuted on January 3, 2022 and will be promoting for 2.5 years under WAKEONE Entertainment's and Swing Entertainment's management.

The members of Kep1er are: Sakamoto Mashiro, Kang Yeseo, Ezaki Hikaru, Seo Youngeun, Choi Yujin, Kim Dayeon, Kim Chaehyun, Shen Xiaoting, and Huening Bahiyyih.

The name Kep1er means capture and one. 'Ke' rhymes with 'capture' and it represents how the girls were able to capture their dreams. The 1 in the name represents how the members got together and became the one and best group.

No. Members9
MembersSakamoto Mashiro, Kang Yeseo, Ezaki Hikaru, Seo Youngeun, Choi Yujin, Kim Dayeon, Kim Chaehyun, Shen Xiaoting, and Huening Bahiyyih
Oldest MemberChoi Yujin (born Aug 12, 1996)
Youngest MemberKang Yeseo (born Aug 22, 2005)
DebutJanuary 3, 2022

Kep1er Member Ages

Kep1er Age Ranking

Ranked from oldest to youngest.

1. YujinAug 12, 199627 years old
2. Shen XiaotingNov 12, 199924 years old
3. Sakamoto MashiroDec 16, 199924 years old
4. Kim ChaehyunApr 26, 200221 years old
5. Kim DayeonMar 02, 200321 years old
6. Ezaki HikaruMar 12, 200420 years old
7. Huening BahiyyihJul 27, 200419 years old
8. Seo Young EunDec 27, 200419 years old
9. YeseoAug 22, 200518 years old

Kep1er Member Heights

Kep1er Height Ranking

Ranked from tallest to shortest.

1. Shen Xiaoting1.68 m (5'6")
2. Huening Bahiyyih1.67 m (5'6")
3. Yujin1.63 m (5'4")
4. Kim Chaehyun1.61 m (5'3")
5. Kim Dayeon1.58 m (5'2")
6. Seo Young Eun1.58 m (5'2")
7. Sakamoto Mashiro1.58 m (5'2")
8. Yeseo1.57 m (5'2")
9. Ezaki Hikaru1.55 m (5'1")


Kep1er is composed of nine members born between 1996 and 2005. Their names are: Sakamoto Mashiro, Kang Yeseo, Ezaki Hikaru, Seo Youngeun, Choi Yujin, Kim Dayeon, Kim Chaehyun, Shen Xiaoting and Huening Bahiyyih.

Kep1er has 6 South Korean members, 1 Chinese member, and 2 Japanese members. Kang Yeseo, Seo Youngeun, Dayeon, Choi Yujin, and Kim Chaehyun are South Korean. Huening Bahiyyih was born in Korean but is of mixed ethnicity. Ezaki Hikaru and Sakamoto Mashiro are Japanese. Shen Xiaoting is the only Chinese member.

The oldest member of Kep1er is Choi Yujin (born Aug 12, 1996). She was 25 years old when she was competing in Girls Planet 999. The youngest member is Kang Yeseo (born Aug 22, 2005). She was 16 years old when she was competing in Girls Planet 999.


The official position of leader is held by Yujin. The co-leader is Mashiro.

These are the positions of each of Kep1er's members:

Kim Chaehyuncenter, main vocalist
Huening Bahiyyihvocalist
Choi Yujinleader, vocalist
Kim Dayeonmain dancer, rapper
Seo Youngeunvocalist, rapper, dancer
Kang Yeseovocalist, dancer, maknae
Ezaki Hikarumain rapper, dancer
Sakamoto Mashiroco-leader, lead vocalist
Shen Xiaotingvocalist, visual

Final Ranking from Girls Planet 999

These are the final rankings from Girls' Planet 999, which determined the final members of Kep1er:

1Kim Chaehyun1,081,182
2Huening Bahiyyih923,567
3Choi Yujin915,722
4Kim Dayeon885,286
5Seo Youngeun781,657
6Kang Yeseo770,561
7Ezaki Hikaru713,322
8Sakamoto Mashiro708,149
9Shen Xiaoting700,663

Kim Suyeon ranked 10th place. Guinn Myah ranked in 11th place.

Fun Facts and Trivia

  • Girls Planet 999 had 99 contestants in total divided in three different groups with 33 contestants each: the K-Group (Korean), C-Group (Chinese), and the J-Group (Japanese).
  • Several members debuted in other groups prior to debuting with Kep1er. Kang Yeseo was part of Busters. Choi Yujin was a member of CLC. Ezaki Hikaru was a member of +GANG.
  • Several members participated in survival shows before winning Girls Planet 999. Kim Dayeon was in Produce 48. Shen Xiaoting was in Produce Camp 2020.
  • The tallest member of Kep1er is Shen Xiaoting with a height of 168 cm.
  • The shortest member of Kep1er is Ezaki Hikaru with a height of 154.5 cm.
  • There is an age gap of 9 years between the oldest member (Yujin) and the youngest member (Yeseo).
  • There is a height gap of 13 cm between the tallest member (Xiaoting) and the shortest member (Hikaru).

Choi Yujin


Birthday: Aug 12, 1996

Country of Birth: South Korea

Height: 163 cm (5'4")

Zodiac: Leo


Hobbies: pilates, watching movies.

Specialty: Japanese.

Choi Yujin is the oldest member and the leader of Kep1er. She is a former member of the Kpop group CLC. Yujin was part of the dance line. She ranked #3 in the final episode of Girls Planet 999.

C'mon...I need more facts about Yujin!

Shen Xiaoting


Birthday: Nov 12, 1999

Country of Birth: China

Height: 168 cm (5'6")

Zodiac: Scorpio


Hobbies: watching movies.

Specialty: dancing.

Shen Xiaoting is the only Chinese member that made the final lineup of Kep1er. She was one of the most popular members among international fans. She was voted the prettiest member by the contestants of Girls Planet 999. Prior to Kep1er, she participated in Camp 2020. She also won a gold prize and ranked #1 in a modern dance competition in Shanghai. She ranked #9 in Girls Planet 999.

More of Xiaoting, please!

Sakamoto Mashiro


Birthday: Dec 16, 1999

Country of Birth: Japan

Height: 158 cm (5'2")

Zodiac: Sagittarius


Hobbies: playing with cats, walking.

Specialty: cooking, dancing, staying still without doing or thinking about anything.

Sakamoto Mashiro is the co-leader of Kep1er. She was a trainee from JYP Entertainment. She trained alongside ITZY members. She stayed with the company for 2 years and left in 2018. She won the most votes from the J Group during the pre-broadcast one-pick voting. Prior to Girls Planet 999, she had been living in Korea for over 5 years. Her final ranking was #8.

I want to know more about Mashiro!

Kim Chaehyun


Birthday: Apr 26, 2002

Country of Birth: South Korea

Height: 1601cm (5'3")

Zodiac: Taurus


Hobbies: dancing, exercising, others.

Specialty: vocal, DIY, Japanese.

Kim Chaehyun was ranked #1 in the finale of Girls Planet 999. She is a former SM Entertainment trainee. Her specialty is singing. She became a trainee in her second year of middle school. She trained for 6 years prior to joining Girls Planet 999.

That's it?! I need more facts about Chaehyun!

Kim Dayeon


Birthday: Mar 2, 2003

Country of Birth: South Korea

Height: 158 cm (5'2")

Zodiac: Pisces


Hobbies: walking while listening to music.

Specialty: dance.

Kim Dayeon is a former contestant in Produce 48 (2018). She ranked #70. She was a trainee for 8 months before joining Produce 48. She trained under CNC School (2017-2018). She acted in the drama Famous Princesses (2006). Her final ranking in Girls Planet 999 was #4.

Can't get enough of Dayeon!

Ezaki Hikaru


Birthday: Mar 12, 2004

Country of Birth: Japan

Height: 154.5 cm (5'1")

Zodiac: Pisces


Hobbies: relaxing in the hot spring.

Specialty: eating deliciously, rapping.

Ezaki Hikaru is one of the two Japanese members in Kep1er. Her specialties are rapping and dancing. Her charming point is her smile (which looks like a sloth). She was the center of the J-Group's introduction video in Girls Planet 999. Her final ranking was #7.

Hikaru is my bias!

Huening Bahiyyih


Birthday: Jul 27, 2004

Country of Birth: Korea

Height: 167 cm (5'6")

Zodiac: Leo


Hobby: diary decoration, shopping.

Huening Bahiyyih was born in South Korea. Bahiyyih is part Polish, British and German from her father, and Korean from her mother. She is the youngest of 3 siblings. She is the sister of Huening Kai from TXT and Lea from from VIVA. She ranked #2 in the finale of Girls Planet 999.

I demand more facts about Bahiyyih... NOW!

Seo Young Eun


Birthday: Dec 27, 2004

Country of Birth: South Korea

Height: 158 cm (5'2")

Zodiac: Capricorn


Hobbies: choreography copy, collecting perfumes.

Specialty: hip hop dance, boy group dance.

Seo Young Eun is the second youngest member of Kep1er. During Girls Planet 999, she showed her multiple talents in singing, dancing, and rapping. She quickly impressed fans with her rendition of NCT's Kick It early on in the show. Her final rank in Girls Planet 999 was #5.

I need more of Seoyoung!

Kang Yeseo


Birthday: Aug 22, 2005

Country of Birth: South Korea

Height: 157 cm (5'2")

Zodiac: Leo


Hobbies: drawing, watching webtoons, watching movies.

Specialty: acting, finger training.

Kang Yeseo is the youngest member (maknae) of the group. She is a former member of the kid's group QTL and was a member of the Kpop group Busters. She was only 13 years old when she debuted with Busters. Her final ranking in Girls Planet 999 was #6.

Obsessed and need to know more about Yeseo!

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Related Idols

Other Kpop groups formed through reality shows include: Treasure (YG Treasure Box), I.O.I (Produce 101), fromis_9 (Idol School), IZ*ONE (Produce 48), NiziU (Nizi Project 1), ENHYPEN (I-LAND), Twice (Sixteen).


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