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Nam Yoon-su

— Jeong Seong-yoon

이수민

— Cha Ga-eun

지민혁

— Ahn Do-hyun

Kim Do Ah

— Han Yeo-reum

Oh Se-eun

— Yoo Min

Jang Sung-yoon

— Joo Da-young

Kim Young-jae

— Ryu Jae-hoo

Yoo Kyung

— Kim Ji-ho

Im Too-chul

— Cha Hyeon Soo [Cha Ga Eun's uncle]

So Yun-ho

— Assistant Homeroom Teacher