- Lee Gyu-chang - Na Yu Eop / Park Han Gyul / Homeroom Teacher (voice)
- Bae Jeong-mi - Choi Soo Jeong / Deok Hwa's Grandmother / Female Student (voice)
- Kim Ok-kyung - Hyung Seok's Mom (voice)
- ???
- Kohei Obara
- Hyun Ku Lee
- Lee Young Jin
- Young-Un Park
- Han Kwang-il
- Lee Seung-wook
- ???
- Kim Jae Hyuk
- Hong Yoon-sung
- Kim Eun-jung
- Hyun Joon Kim
- Jeong-eun Song
Shim Kyu-hyuck interpreta a Park Hyung Seok (Small) (voice) en la serie.
Han Shin interpreta a Park Hyung Seok (Big) (voice) en la serie.
Ryu Seung-gone interpreta a Lee Jin Seong / Park Jong Gun (voice) en la serie.
??? interpreta a Vasco / CEO / Lee Nam Su (voice) en la serie.
남도형 interpreta a Jin Ho Bin / Jang Gi Seok / Kim Mae Sik / Park Bum Jae (voice) en la serie.
Hwang Chang-yung interpreta a Pyun Deok Hwa / Lee Tae Sung / Oira (voice) en la serie.
Sa Moon-young interpreta a Park Ha Neul / Female Student / Female Extra (voice) en la serie.
Lee Kyung Tae interpreta a Park Ji Ho (voice) en la serie.
Kim Hyeon-uk interpreta a Lee Hyun Do / Go Jeong Gi / Kim Seul Bum (voice) en la serie.
Lee Gyu-chang interpreta a Na Yu Eop / Park Han Gyul / Homeroom Teacher (voice) en la serie.
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