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Tae Woon takes the fall for the math competition fiasco, but manages to bring the principal down with him. Meanwhile, tensions rise and the school is at risk for an official investigation.
Kim Se-jeong
Ra Eun-Ho
Kim Jung-hyun
Hyun Tae-Woon
Jang Dong-yoon
Song Dae-Whee
Seol In-a
Hong Nam-Joo
Rowoon
Kang Hyun-Il
Z.Hera
Yoo Bit-Na
Han Seon-hwa
Han Soo-Ji
Han Joo-wan
Sim Kang-Myung
Park Se-wan
Oh Sa-Rang
Ha Seung-lee
Hwang Young-Gun
Kim Hee-chan
Kim Hee-Chan
Seo Ji-hoon
Yoon Kyung-Woo
Hong Kyung
Won Byung-Goo
Ahn Seung-gyun
Ahn Jung-il
Kim Si-eun
Lee Myung-jin
Kim Song
Kim Heung-soo
Choi Sung-min