K-pop Boy Groups

BTOB BLUE Members Profile: Full Names, Ages, Heights, Weights and More

June 25, 2026 | By
BTOB BLUE members are Eunkwang, Changsub, Hyunsik, and Sungjae.
OriginSeoul, South Korea
DebutSeptember 19, 2016
Number of Members4
MembersEunkwang
Changsub
Hyunsik
Sungjae
Oldest MemberEunkwang
Youngest Member (Maknae)Sungjae
Tallest MemberSungjae
Shortest MemberEunkwang

BTOB BLUE Members Profile

Eunkwang

Full NameSeo Eun Kwang
BirthdayNovember 22, 1990
BirthplaceN/A
Age35 years and 7 months old
Height5 feet 7 inches (170.5 cm)
Weight136.69 lbs (62 kg)
Zodiac SignSagittarius
Blood TypeA
PositionLeader, Main Vocalist
Instagrambtob_silver_light

Changsub

Full NameLee Chang Sub
BirthdayFebruary 26, 1991
BirthplaceN/A
Age35 years and 3 months old
Height5 feet 10 inches (178 cm)
Weight141.1 lbs (64 kg)
Zodiac SignPisces
Blood TypeO
PositionLead Vocalist
Instagramlee_cs_btob

Hyunsik

BTOB BLUE member Hyunsik
Full NameIm Hyun Sik
BirthdayMarch 7, 1992
BirthplaceN/A
Age34 years and 3 months old
Height5 feet 10 inches (177 cm)
Weight145.5 lbs (66 kg)
Zodiac SignPisces
Blood TypeA
PositionMain Dancer, Lead Vocalist
Instagramimhyunsik

Sungjae

Full NameYook Sung Jae
BirthdayMay 2, 1995
BirthplaceN/A
Age31 years and 1 month old
Height5 feet 11 inches (180 cm)
Weight149.91 lbs (68 kg)
Zodiac SignTaurus
Blood TypeA
PositionLead Vocalist, Face of the Group, Maknae
Instagramyook_can_do_it

Member Ages: Oldest to Youngest

MemberBirthdayAge
EunkwangNovember 22, 199035 years, 7 months, 3 days old
ChangsubFebruary 26, 199135 years, 3 months, 30 days old
HyunsikMarch 7, 199234 years, 3 months, 18 days old
SungjaeMay 2, 199531 years, 1 month, 23 days old

FAQs

How many members are in BTOB BLUE?

BTOB BLUE is a 4-member K-pop boy group. The group consists of Eunkwang, Changsub, Hyunsik, and Sungjae.

When did BTOB BLUE debut?

BTOB BLUE debuted on September 19, 2016, with their single Stand By Me.

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