What's Up?: Cast
Lim Ju-hwan
Jang Jae-Hun
Oh Man-seok
Sun Woo-Yeong
Kim Ji-won
Park Tae-Yi
Im Joo-eun
Oh Doo-Ri
Cho Jung-seok
Kim Byung-Gun
Kang Dae-sung
Ha Do-Sung
Jang Hee-jin
Eun Chae-young
Lee Soo-hyuk
Lee Soo-bin
Ahn Seo-hyun
Oh Doo-ri (young)
Song Ok-suk
Jang Jae-heon's mother
Kim Mi-kyeong
Professor Yang Soo-jung