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Destroyed and defamed, Gi Mu Hyeok returns as a teacher and infiltrates Cheonmyung High School to uncover the truth behind Jung Su Ah's death. On his way to school for the start of the semester, he sees Ha So Hyun in an embarrassing situation. Meanwhile, the kids at the school plan a bare-knuckle fight on the rooftop of the school.
Kim Ye-won
Shin Hye-Soo
Jeong Soo-hyun
Lee Hae Jun
Joo Se-Bin
Na Ye Ri
Lee Jung-jun
Kim Hyung-gyu
Shin Jae-hwi
Shon Jun-jae
Lee Jung-min
Kim So-Hee
Lee Bit-na
Lee Ji-Eun
Jang Dong-ju
Kim Han-Soo
Choi Kyu-jin
Lee Ki-Hoon
Choi Yu-hwa
Cha Hyun-Jung
Geum Sae-rok
Ha So-Hyun
Lee Jun-young
Yoo Beom-Jin
Yoon Kyun-sang
Ki Moo-Hyeok
Woo Hyun-ju
Jeon Young-Hye
Jun Suk-ho
Lee Tae-Seok
Kwon So-hyun
Seo Yoon-Ah
Byung Hun
Ahn Byung-Ho
Jeong Da-eun
Jung Soo-Ah
Suh Yun-a
Jo Mi-Joo
Seo Ji-young
Woo Eun-Hye
Kim Min-sang
Yoo Yang-Gi
You Seong-joo
Lee Do-Jin