Undercover High School

Seo Kang-Joon

Jeong Hae-seong

Jin Ki-joo

Oh Soo-ah

Min-joo Kim

Lee Ye-na

Shin-rock Kim

Seo Myeong-joo

Yun Chae Bin

Yun Chae Rin

Park Se-hyun

Ahn Yoo-jeong

Jeon Bae-soo

Ahn Seok-ho

Kim Young-ah

Soo-ah's Mother

Yoon Ga Yi

Park Mi-jeong

Jo Bok-rae

Go Young-hoon

Park Jin-Woo

Park Jae-moon

Lee Seo-hwan

Kim Hyeong-bae

Min-ji Lee

Kim Ri-an

Lee Hyun So

Han Seung-jae

Shin Joon-hang

Lee Dong-min

Yong Oh

Head teacher

Yu Ji-wan

Jeong Hae-seong (Child)

Joo Suk-tae

Seung-jae’s Father