What's Up?

Lim Ju-hwan

as

Jang Jae-Hun

Oh Man-seok

as

Sun Woo-Yeong

Kim Ji-won

as

Park Tae-Yi

Im Joo-eun

as

Oh Doo-Ri

Cho Jung-seok

as

Kim Byung-Gun

Kang Dae-sung

as

Ha Do-Sung

Jang Hee-jin

as

Eun Chae-young

Lee Soo-hyuk

as

Lee Soo-bin

Ahn Seo-hyun

as

Oh Doo-ri (yo...

Song Ok-suk

as

Jang Jae-heon'...

Kim Mi-kyeong

as

Professor Yang...