When Jo Kang Ja learns that her daughter is being intimidated by some classmates, she decides to enroll in high school as an undercover student to teach the bullies a lesson.
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Kim Hee-seon
Jo Kang-ja
Yoo-jung Kim
Oh Ah-ran
Hyun-Woo Ji
Park No-ah
Ji Soo
Go Bok-dong
Baro
Hong Sang-tae
Yeong-gyu Park
Hong Sang-bok
Kim Hee-won
Ahn Dong-chil
Soo-Ah Park
Wang Jung-hee
Kim Tae-hoon
Do Jung-woo
Jung Shin-Hye
Lee Hwang-song (grade 2 class 3)
Ji-hee Suh
Hwang Min-joo
Su-hee Go
Han Gong-joo
Ye-Seul Choi
Ahn Tae-hee
Nam-Yong Seo
Sang Man
Seul-ki Kim
Jong Man
Se-yun Han
Na Do-hee
Hyeong-jun Lim
Oh Jin-sang
Geun-hyeong Park
Kang Soo-chan
