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Yoon Su gets overwhelmed with mixed and complex emotions after hearing Seung Yoo profess his love for her. Gyu Yeung notices Seung Yoo's love for Yoon Su and uses it to blackmail him. Meanwhile, Yu Hye Mi takes things into her hands for the midterms Ye Rin is about to face. However, Yoon Su finds something suspicious in Ye Rin's midterm answer sheet.
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