Character

Yoon Doojoon(B2ST) as Baek Doojoon/Yoon Doojoon (24)

-final year college student -major in architecture

-Baek Siwan's younger step-brother

-2nd son of Baek Yonghak,chairman of BAEKYOON Legacy.

Im Siwan(ZE:A) as Baek Siwan (25)

-Director of BAEKYOON Legacy

-Baek Doojoon's older step-brother

-1st son of Baek Yonghak, chairman of BAEKYOON Legacy.

Heo Gayoon(4minute) (23)

-2nd year college student

-major in art

-crush on Baek Siwan

-only daughter of the owner of Fried Chicken Restaurant.

Uee(After School) as Kim Yoojin /Uee(25)

-famous model

-works for BAEKYOON Legacy

-family friend with Baek family since child

-Baek Siwan's ex-girlfriend -still have a feel for Baek Siwan.

Nam Jihyun(4minute) (23)

-Heo Gayoon bestfriend

-2nd year college student

-major in art

-playing hard to get to Cha Sunwoo.

Baro(B1A4) as Cha Sunwoo/Baro (21)

-Heo Gayoon and Nam Jihyun's junior/bestfriend

-1st year college student

-like Nam Jihyun nuna

-Music genius  

-enter the college 1 year early than the others.

Park Jiyeon  (19)

-high school senior

-Cha Sunwoo's junior in high school

-Cha Sunwoo's no1 fans

Jinon(F.Cuz) (24)

-final year college student

-Baek Doojoon's bestfriend

-knows Baek Doojoon since elementary

-major in architecture

-famous in college.

Sungkyu(Infinite) (24)

-final year college student

-Baek Doojoon and Jinon's bestfriend

-knows Doojoon and Jinon since freshman

-major in architecture.

Lee Joon(MBLAQ) (25)

-Baek Siwan's bestfriend since high school

-head of personal assistant at BAEKYOON Legacy.

Fictional Characters

Baek Yonghak - Baek Doojoon and Baek Siwan's father.

Han Soomin - Baek Siwan's mother.

Yoon Miryoung -Baek Doojoon's mother