K-pop Boy Groups

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

June 27, 2026 | By
ASTIN members are Seungjun, Hongil, and Hyeongseok.
OriginSeoul, South Korea
DebutMarch 7, 2019
Disbanded2019
Number of Members3
MembersSeungjun
Hongil
Hyeongseok
Jingyu
Logan (formerly Mir)
Junghun
Yeram
Oldest MemberSeungjun
Youngest Member (Maknae)Hyeongseok
Tallest MemberHyeongseok
Shortest MemberMir

ASTIN Former Members Profile

Seungjun

ASTIN member Seungjun
Full NameJi Seungjun
BirthdaySeptember 15, 1998
BirthplaceN/A
Age27 years and 9 months old
Height5 feet 9 inches (175 cm)
Weight143 lbs (65 kg)
Zodiac SignVirgo
PositionLeader, Main Vocalist
Instagram@jx_jun

Hongil

ASTIN member Hongil
Full NameYoon Hongil
BirthdayJanuary 11, 1999
BirthplaceN/A
Age27 years and 5 months old
Height5 feet 11 inches (182 cm)
Weight154 lbs (70 kg)
Zodiac SignCapricorn
PositionLead Vocalist
Instagram@astin_y_h.i

Hyeongseok

ASTIN member Hyeongseok
Full NameChu Hyeongseok
BirthdaySeptember 13, 2000
BirthplaceN/A
Age25 years and 9 months old
Height6 feet 0 inches (183 cm)
Weight152 lbs (69 kg)
Zodiac SignVirgo
PositionMain Rapper, Maknae
Instagram@bu___chu

Jingyu

ASTIN former member Jingyu
Full NameLee Jingyu
BirthdayApril 22, 1998
BirthplaceN/A
Age28 years and 2 months old
Height5 feet 9 inches (176 cm)
Weight126 lbs (57 kg)
Zodiac SignTaurus
PositionMain Rapper, Main Dancer, Vocalist
Instagram@ijin_gyu98

Logan (formerly Mir)

ASTIN former member Logan (formerly Mir)
Full NameLee Yoonsang
BirthdayMarch 06, 2000
BirthplaceN/A
Age26 years and 3 months old
Height5 feet 8 inches (173 cm)
Weight126 lbs (57 kg)
Zodiac SignPisces
PositionLead Rapper, Vocalist
Instagram@astin_mir

Junghun

ASTIN former member Junghun
Full NameJang Junghun
BirthdayFebruary 27, 1999
BirthplaceN/A
Age27 years and 4 months old
Height5 feet 8 inches (173 cm)
Weight121 lbs (55 kg)
Zodiac SignPisces
PositionLead Vocalist
Instagram@j_jung_hun

Yeram

ASTIN former member Yeram
Full NameYang Yeram
BirthdayMarch 31, 2000
BirthplaceN/A
Age26 years and 2 months old
Height5 feet 8 inches (173 cm)
Weight130 lbs (59 kg)
Zodiac SignAries
PositionVocalist
Instagram@astin_yy

Member Ages: Oldest to Youngest

MemberBirthdayAge
JingyuApril 22, 199828 years, 2 months, 5 days old
SeungjunSeptember 15, 199827 years, 9 months, 12 days old
HongilJanuary 11, 199927 years, 5 months, 16 days old
JunghunFebruary 27, 199927 years, 4 months old
Logan (formerly Mir)March 06, 200026 years, 3 months, 21 days old
YeramMarch 31, 200026 years, 2 months, 27 days old
HyeongseokSeptember 13, 200025 years, 9 months, 14 days old

FAQs

How many members are in ASTIN?

ASTIN is a 3-member K-pop boy group. The group consists of Seungjun, Hongil, Hyeongseok, Jingyu, Logan (formerly Mir), Junghun, and Yeram.

When did ASTIN debut?

ASTIN debuted on March 7, 2019, with their album Mirror Mirror.

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