Pemeran What's Up?

Im Joo Hwan (임주환)

as Jang Jae Hun

Pemeran Utama

Oh Man Seok

as Sun Woo Yeong

Pemeran Utama

Kim Ji Won

as Park Tae Yi

Pemeran Utama

Im Ju Eun

as Oh Doo Ri

Pemeran Utama

Jo Jung Suk (조정석)

as Kim Byung Gun

Pemeran Utama

Kang Dae Sung

as Ha Do Sung

Pemeran Utama

Jang Hee Jin (장희진)

as Eun Chae Yeong

Pemeran Utama

Jin Yi Han

as Director Kang

Pemeran Pembantu

Kim Mi Kyung

as Yang Su Jeong

Pemeran Pembantu

Kwon Yul (권율)

as Manager Oh

Pemeran Pembantu

Lee Soo Hyuk (이수혁)

as Lee Soo Bin

Pemeran Pembantu

Yook Hye Seung

as Yeon Joo

Pemeran Pembantu

Yang Ji Won

as Yang Ji Eun

Pemeran Pembantu

Lee Ho Young

as Detective Cho

Pemeran Pembantu

Jung Neom Chyeo

Pemeran Pembantu

Kim Ga Eun

as Ga Young

Pemeran Pembantu

Yoo Hae Won

as Jin Yeong

Pemeran Pembantu

Kwon Young Deuk

as One of the twins

Pemeran Pembantu

Kwon Young Don

as One of the twins

Pemeran Pembantu

Yang Hee Kyung

as [Doo Ri's mom]

Pemeran Pembantu

Kim Sung Ryung

as Ha In Young [Do Sung's mom]

Pemeran Pembantu

Song Ok Sook

as [Jae Hun's mom]

Pemeran Pembantu

Baek Jae Jin

as Mr. Bae

Bintang Tamu

Kim Do Jin

as [Student]

Bintang Tamu

Ham Jin Sung

as [Police officer]

Bintang Tamu

Jung Young Sook

as [Chancellor]

Bintang Tamu

Bae Yu Ra

as [Musical theater department student]

Bintang Tamu

Kim Chang Wan

as [Tae Yi's dad]

Bintang Tamu

Song Ji Won

Sutradara

Song Ji Na

Screenwriter