[CAST] 사춘기 메들리 (Puberty Medley)

Kwak Dong Yeon (곽동연) as Choi Jung Woo (최정우)

Lee Se Young (이세영) as Yang A-Young (양아영)

Choi Tae Joon (최태준) as Lee Yeok Ho (이역호)

Kwak Jeong Wook (곽정욱) as Lim Deok Weon (임덕원)

and

Bae Noo Ri (배누리) as Jang Hyun Jin (장현진)

Park Jung Min (박정민) as Shin Young Bok (신영복)

Yoon Park (윤박) as Lee Won il (이원일)

Baek Sung Hyun (백성현) as adult Choi Jung Woo (최정우) <with this style, he's looks like Boyfriend's HyunSeung^^>

Special Appearance:

Baek Sung Hyun (백성현), INFINITE Lee Seong Yeol (이성열), CNBLUE Lee Jong Hyun (이종현), Sung Hae (성해) as himself (MC) 

  

CNBLUE Lee Jong Hyun (이종현) as Yang Young Woong 양영웅 (A-Young’s older brother

INFINITE Lee Seong Yeol (이성열) as Student Council President (Ketua Persatuan Pelajar)