GEUM JAN DI (KOO HYE SUN)

Name: 구혜선 / Koo Hye Sun (Gu Hye Seon)
Profession: Actress and singer
Birthdate: 1984-Nov-09
Birthplace: Seoul, South Korea
Height: 163cm
Weight: 42kg
Star sign: Scorpio
Blood type: A
Talent agency: YG Entertainment (http://www.ygfamily.com/)

GU JUN PYO (LEE MIN HO)

Name: Lee Min Ho
Date of birth: June 22, 1987 (1987-06-22) (age 21)
Height: 186cm
Star sign: Cancer
Blood type: A
Family: Father, Mother, Older sister.
Schools: Namsung Elementary School, Banpo Middle School, Danggok High School, Konkuk University - Cinema major

SO YI JUNG (KIM BUM)

Name: 김범 / Kim Bum
Real Name: 김상범 / Kim Sang Bum
Profession: Actor
Birthdate: 1989-Jul-07
Height: 181cm
Weight: 63kg
Star sign: Cancer
Talent agency: EYAGI Entertainment (http://www.eyagi-ent.com/)
Family: Younger sister and brother, cousin/singer Jini

SONG WOO BIN (KIM JOON)

Name: 김준 / Kim Joon (Kim Jun)
Real name: 김형준 / Kim Hyung Joon (Kim Hyeong Jun)
Profession: Singer and actor
Birthdate: 1984-Feb-03
Height: 183cm
Weight: 64kg
Star sign: Aquarius
Blood type: O
Talent agency: 2step Entertainment

YOON JI HOO (KIM HYUN JOONG)

Name: 김현중 / Kim Hyun Joong (Gim Hyeon Jung)
Profession: Actor, singer
Birthdate: 1986-Jun-6
Birthplace: Seoul, South Korea
Height: 180cm
Weight: 68kg
Blood type: B
Star sign: Gemini

F.Y.I => i get this from dramawiki x)