Director
Eung Bok Lee
DIRECTOR
Sung-Yoon Kim
Stars (in credits order)
J.Y. Park
Yang Jin-man
Bae Suzy
Go Hye-mi
Kim Soo-Hyun
Song Sam-dong
IU
Kim Pil-sook
Taecyeon
Hyun Si-hyuk (Jin-gook)
Hahm Eun-Jung
Yoon Baek-hee
Jang Woo-young
Jason
Jin-woon Jung
Jin Yoo-jin
Uhm Ki-joon
Kang Oh-hyeok
Byung-Joon Lee
Si Beom-soo
Kang So-ra
Sin Hae-seong
Ji-Yeon Park
Ri-an
J.B.
JB
Hyolyn
Na-na
Park Seo-joon
Si-woo
Seo-hyun Ahn
Go Hye-seong
Bo-reum Han
Ha So-hyeon
Lee Yun-ji
Si Kyeong-jin
Ahn Kil-kang
Ma Doo-sik
Yoon-mi Lee
Maeng Seung-hee
Ji-yoo Yoon
Lee Ri-ah
Ji-hoo Han
Park Do-joon
Jae-woong Park
Big Guy
Min-joo Jung
Jeong Ah-jeong
Sun-yeong Ahn
Kang Woo-seon
Jin-sang Park
Jeon Tae-san
Won-kil Baek
Gong Min-cheol
No Jeong-ee
Shin Hae-poong
Park Jin-young
Jung Ui-bong
Yeo-jin Choi
Ahn Tae-yeon
Jeong-tae Kim
Lee Kang-chul
Ailee
Ji-Soo Kim
Park Hong-joo
So-Hye Kim
Friend rushing to report a fainting student
Jung-Won Yang
Jeong Eui-bong
Jeon Min-Joon
Jo In-seong
Hae-hyo Kwon
Joo Jung-wan
Park Ji-young
Hyun Ji Soo
So-young Yoo
Park Soon-dong
Yeon-joo Jung
Lee Seul
Jeong Gyu-su
Shin Hae-sung's Father
Park Won-Sang
Yoon Seong-gil
Hee-seok Yun
Shin Jae-in
Mi-seon Hwang
Rian's Mother
Il-hwa Choi
Hyeon Moo-jin
Hye-suk Lee
Song Nam-boon
Seon-Nyeo Kim
Jin Yoo-jin's Mother
Hee-soo Jang
Kang Hee-seon
Jung-ui No
Shin Hae-pung (Shin Hae-sung's sister)
Yong-jun Bae
Jeong Ha-myeong
Hyuk-kwon Park
Go Byeong-jik
Noo-Ri Bae
Han So-ri
Yi-suk Kang
Young Hyun Si-hyuk (Jin-gook)
Hwi-Soon Park
Jin-gook's Roommate
Feifei Wang
Flash Mob Dancer
Jia Meng
Min
Jun-yup Koo
Koo Jun-yup
Lee Joo Yeon
Young Go Hye-mi
Psy
Trainer Coach
Park Eun-bin
16 years old Go Hye-seong
Da-eun Baek
Kirin Student
Nichkhun
Romeo
Hyuk-jae Lee
Eunhyuk
Hae Song
Song Hae
Jeong-su Park
Leeteuk
Ah Young
Seul-ong Im
Jo Kwon
Su-bin Cho
Steven McNelly
ACTOR
Young-hoon Joo
Joo Young-hoon
Ga-eun Cho
Jiyul
Serri
Jung Eun Jo
Teen Shin Hae-pung (Shin Hae-sung's Sister)
Young-Hyun Kang
Ye-Eun Park
Self
Kim Hyun-joong
Selfuncredited
Hwang Chan-sung
Kang Woo-seon's Imaginary Boyfrienduncredited
Soo-mi Jo