K-pop Girl Groups

AtHeart Members Profile: Full Names, Ages, Heights, Weights and More

March 25, 2026 | By Kris Lodhi

atheart members are Arin, Bome, Nahyun, Katelyn, Michi and Seohyeon

Origin	Seoul, South Korea
Debut	August 13, 2025
Debut Album	Plot Twist
Number of Members	7
Members	Arin Michi Katelyn Bome Seohyeon Aurora Nahyun
Former Member	Sorin
Oldest Member	Arin
Youngest Member (Maknae)	Nahyun
Tallest Member	Michi
Shortest Member	Katelyn
Social Media	Instagram: @atheart.titan X: @atheart_titan TikTok: @atheart.titan Youtube: AtHeart_TITAN Weibo: @AtHeart_Official Douyin: AtHeart_Official BiliBili: AtHeart_TITAN Xiaohongshu: AtHeart_TITAN

Table of Contents

AtHeart Members Profile

Arin

AtHeart member Arin

Full Name	Lee Arin
Birthday	July 01, 2007
Birthplace	Wonju, South Korea
Age	18 years and 8 months old
Height	5 feet 4 inches (164 cm)
Weight	N/A
Zodiac Sign	Cancer
Chinese Zodiac Sign	Pig
Blood Type	N/A
MBTI	ISFJ
Nationality	Korean
Education	Hanlim Multi Arts School
Position	Leader, main dancer
Instagram	@arinatheart

Michi

AtHeart member Michi

Full Name	Kim Misook
Birthday	May 06, 2007
Birthplace	Honolulu, Hawaii
Age	18 years and 10 months old
Height	5 feet 8 inches (174 cm)
Weight	N/A
Zodiac Sign	Taurus
Chinese Zodiac Sign	Pig
Blood Type	N/A
MBTI	ENTJ
Nationality	Japanese-American
Education	N/A
Position	N/A
Instagram	@michiatheart

Katelyn

AtHeart member Katelyn

Full Name	Katelyn Angela Ejercito Tan
Birthday	July 24, 2007
Birthplace	Parañaque, Philippines
Age	18 years and 8 months old
Height	5 feet 3 inches (162 cm)
Weight	N/A
Zodiac Sign	Leo
Chinese Zodiac Sign	Pig
Blood Type	N/A
MBTI	INFJ
Nationality	Filipina
Education	N/A
Position	N/A
Instagram	@katelynatheart

Bome

AtHeart member Bome

Full Name	Lee Bom
Birthday	November 26, 2007
Birthplace	Geochang, South Korea
Age	18 years and 3 months old
Height	5 feet 5 inches (166 cm)
Weight	N/A
Zodiac Sign	Sagittarius
Chinese Zodiac Sign	Pig
Blood Type	N/A
MBTI	ISFJ
Nationality	Korean
Education	Hanlim Multi Arts School
Position	Main vocalist
Instagram	@bomeatheart

Seohyeon

AtHeart member Seohyeon

Full Name	Moon Seohyeon
Birthday	September 12, 2008
Birthplace	Taean, South Korea
Age	17 years and 6 months old
Height	5 feet 3 inches (162 cm)
Weight	N/A
Zodiac Sign	Virgo
Chinese Zodiac Sign	Rat
Blood Type	N/A
MBTI	ISTP
Nationality	Korean
Education	N/A
Position	N/A
Instagram	@seohyeonatheart

Aurora

AtHeart member Aurora

Full Name	N/A
Birthday	July 04, 2009
Birthplace	Tokyo, Japan
Age	16 years and 8 months old
Height	N/A
Weight	N/A
Zodiac Sign	Cancer
Chinese Zodiac Sign	Ox
Blood Type	N/A
MBTI	ENFP
Nationality	Japanese
Education	N/A
Position	N/A
Instagram	@auroraatheart

Nahyun

AtHeart member Nahyun

Full Name	Kim Nahyun
Birthday	September 03, 2009
Birthplace	Cheongju, South Korea
Age	16 years and 6 months old
Height	5 feet 7 inches (172 cm)
Weight	N/A
Zodiac Sign	Virgo
Chinese Zodiac Sign	Ox
Blood Type	N/A
MBTI	ISTP
Nationality	Korean
Education	Hanlim Multi Arts School
Position	Maknae
Instagram	@nahyunatheart

Former Member Profile

Sorin

AtHeart former member Sorin

Full Name	N/A
Birthday	July 09, 2007
Birthplace	Sokcho, South Korea
Age	18 years and 8 months old
Zodiac Sign	Cancer
Chinese Zodiac Sign	Pig
MBTI	ENTJ
Nationality	Korean

Member Ages: Oldest to Youngest

AtHeart members

Member	Birthday	Age
Michi	May 06, 2007	18 years, 10 months, 19 days old
Arin	July 01, 2007	18 years, 8 months, 24 days old
Katelyn	July 24, 2007	18 years, 8 months, 1 day old
Bome	November 26, 2007	18 years, 3 months, 27 days old
Seohyeon	September 12, 2008	17 years, 6 months, 13 days old
Aurora	July 04, 2009	16 years, 8 months, 21 days old
Nahyun	September 03, 2009	16 years, 6 months, 22 days old

FAQs

How many members are in AtHeart?

AtHeart is a 7-member K-pop girl group. The group consists of Arin, Michi, Katelyn, Bome, Seohyeon, Aurora, and Nahyun.

When did AtHeart debut?

AtHeart debuted on August 13, 2025, with their album Plot Twist.