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At Asung High, Yoon Su’s new workplace, she gives a tricky question for students who want to join the math club. While no one in the class got the question right, a correct answer sheet is posted on the board outside the classroom. To find out who did it, Yoon Su provokes them and manages to find who it is.
Lim Soo-jung
Ji Yoon-soo
Lee Do-hyun
Baek Seung-yoo
Jin Kyung
Noh Jung-ah
Woo Da-vi
Sung Ye-rin
Jang Hyun-sung
Sung Min-joon
Byeon Jung-su
Yoo Hye-mi
Choi Dae-hoon
Ryu Sung-jae
Baek Ji-won
Min Hee-seung
Kim Ho-jin
Baek Min-shik
Jeon Guk-hyang
Shin Kyung-in
Oh Hye-won
Noh Yeon-woo
Lee Kang-ji
Lee Hyun-jae
Kim Ji-young
Kim Ji-na
Oh Kwang-rok
Ji Hyun-wook
Han Gi-joong
Ryu Hyun-il
Choi Seung-hoon
Young Baek Min-jae
Jang Gwang
Noh In-Hyeong
Son Jin-hwan
Principal Oh Jin-taek
Jeon Jin-gi
Vice Principal Choi Sung-han
Yang Jo-a
Kim Jin-hee
Ahn Sang-woo
Han Myung-Jin
Choi Woo-sung
Jang Kyu-young
Lee Young-eun
Park So-jung