- Oh Dong-min - Choi Jin-Sang
- Song Ji-in - Teacher Oh
- Kim Moo-yul - Heo Joon-Ki
- Go Bo-gyeol - Lee Eun-Jae
- Park Gyu-young - Kang Hyun-Ho
- ?? - Han Yoo-Ra
- ??? - Kim Yang-Hee
- ??? - Kim Yang-Hee (young)
- Jeon Seong-woo - Lee Pil-Yong (young)
- ??? - Miss Kim
- Kwon Hyuk-soo - Mr. Lee (Lee Ki-Joon)
- ??? - Choi Sung-Min
- ??? - Yoo Eun-Hye
- Jang Hee-jin - Jung Yi-Na
- Lim Ju-hwan - Bae Sang-Hee
- ??? - Hee-Joo
- ??? - Oh Eun-Young
- Kim Yeong-ok - Bang Cho-Rong
- Han In-soo - Lee Jong-Dae
- Lee Da-in - Yoo Seung-Yeon
- Kim Min-seok - Kang Sung-Chan
- Park You-na - Joo Young-Joo
- ??? - Yoon Hae-Rim
- ??? - Uhm Ki-Seok
- ??? - Oh Dong-Kyung
- ??? - Lee Joon-Hyuk
- ??? - Yoon Ki-Hyun
- Nam Kee-ae - Kim Mi-Hee
- Ko Gun-han - Lee Jung-Ho
- Lee Hyun-Jin - Park Eun-Young
- ??? - Professor Bong
- Min Jin-woong - Jang Hyung-Joon
- Min Jin-woong - Yoon Si-Woo
- Park Sun-Hee - Professor No
- Go Min-si - Choi Ji-Young
- Seo Jae-woo - Kim Woo-Hyun
- ??? - Chairwoman Yoon
- ??? - Lee Soo Hyun
- ??? - Kim Shin Ae
- ??? - Kwang Hyun
- Choo So-yeong - Ye Rin
- Lee Hwa - Detective Kim
- Hwang Young-hee - Mrs Choi
- Shin Hyun-soo - Lee Hyun-Soo
- Yoon In-Jo - Jung Yang
- Moon Se-yoon - Park Goon
- ??? - Bae Chi-Hwan
- Lee Jung-eun - Young-Hee
- Oh Na-ra - Jae-Hee
- Kang Yeon-jung - Yoo Ji-Yool
- ??? - Heo Yoon-Ki
- ??? - Do Do-Hye
- ??? - Hwang Ju-eun
- Ahn Seung-gyun - Seo Min-Joon
- ??? - Se-Young
- ??? - Choi Hyeong-won
- Lee Hak-ju - Do-sik
- Lee Hak-ju - Lee Min-soo
- Lee Hak-ju - Ji-Wook
- Park Sung-hoon - Go Tae-hoon
- Park Sung-hoon - Doh Yu-bin
- Park Sung-hoon - Na Pil-Seung
- Song Jin-woo - Gong Sang-beom
- ??? - Joo Baek-min
- ??? - Na Young-Do
- Lee Yul-eum - Oh Eun-Soo
- Yeon Jun-seok - Lee Kang-Woo
- Park Jong hwan - Han Young-jin
- ??? - Shin Na-ra
- Bae Yoon-kyung - Kang Na-ra
- Kim Sae-ron - So-ssang
- Lee Seung-hun - Kim Do-Il
- ??? - Park So-Jin
- Shin Ye-eun - Oh Jin
- Kang Tae-oh - Cha Min-jae
- Hong Kyung - Koo Won-bin
- ??? - Jeong Yoon-jeong
- ??? - Gong Ji-hun
- Byeon Seo-yun - Joo Si-young
- Jung Yi-seo - Woo Hyeong-ju
- ??? - Jang Yeon-jun
- ??? - Yoon Gwang-sook
- Kim Ki-hae - Oh Byeong-hun
- Son Sang-kyung - Lim Seong-gu
- ??? - Choi Tae-pil
- Kim Sang-woo - Kwak Jae-ho
- Kim Min-cheol - Choi Nak-hyeon
- Hong Seo-hee - Kim Anna
- Pyo Young-seo - Lee Da-mi
- Kim Sun-bin - Go Tae-jun
- Shin Eun-soo - Kim Jae-young
- Kim Jae-won - Seo Woo-gyu
- ??? - Choi Tae-jeong
- Han Ji-eun - Oh Hee-joo
- Kim Gun-woo - Myung Ki-jun
- Jung Yu-mi - Gye Choon Bin
- Jung Yu-mi - Gye Chun Bin
- Koh Ae-ri - Bang Yeon-jin
- Jung Kyung-ho - Wang Ki-Nam
- Jung Kyung-ho - Wang Ki Nam
- Choi Dae-hoon - Choi Byung-mo
- Im Ye-jin - Kim Jin-sook
- Kang Seung-yoon - Ban Dae-su
- Choi Jae-sup - Tae Gi-ho
- Kang Sung-hoon - Baek Cheol-yong
- Woo Min-kyu - San Cho-rok
- Cho Sung-won - Secretary Kim
- ??? - Seol Tae-jun
- Oh Ha-nee - Ku Hyo-joo
- Kim Won-hae - Lee Myung-gook
- Kim Won-hae - Han-gil
- Park Kang-seop - Jeong Nam-il
- Jeon Hye-won - Lim Da-in
- Lee Do-yeop - Jang Dong-hyeon
- Shin Yeon-suh - Jeong A-reum
- Jang Yoo-sang - Yoon Dae-beom
- ??? - Ahn Bo-young
- Jung Young-ju - Mrs. Kim
- Min Ji-a - Na Yeon
- Min Ji-a - Im Jin-yeong
- Min Ji-a - Na-Yeon
- Kim So-eun - Lim Sun-ae
- ??? - Lee Sang-hee
- ??? - Kim Da-eun
- Kim Yun-seul - Go Hee-soo
- Heo Dong-won - Yi-joon's Father
- Heo Dong-won - Jung Dong-Ho
- Kim Ju-hun - Lee Jung-yeol
- Kim Ju-hun - man in charge
- Choi Jin-hyuk - Choi Tae-seung
- Park Seong-yeon - Seo Hye-seon
- Seong Yu-bin - Kim Yun-yi / Kim Hwan-yi
- Jeong Da-eun - Bong-sun
- Seo Eun-young - Kwon-min
- So Joo-yeon - Kim Jong-hee
- Joe In - Kang Bo-ri
- ??? - Kim Jae-hwa
- Jo Dal-hwan - Lee Ji-ro
- Jo Dal-hwan - Manager Oh
- Kim Na-yeon - Ahn Hee-jeong
- ??? - Old Lady
- ??? - Cha Song-ja
- ??? - Choi Kyung-mi
- Choi Hong-il - Kim Jun-ho
- Moon Geun-young - Oh Eun-soo
- ??? - Jeong Seok-young
- Kang Sang-jun - Hae-gak
- Lee Ha-young - Dan Ji
- Lee Jae-won - Choi Su-yeol
- ??? - Yoo Yeon-hun
- Yoon Se-woong - Go Sang-mu
- Kim Shi Woo - Jeong Du-ri
- Ahn Se-bin - Song Min-ah
- Park Ji-a - Seok-ran
- Kim Young-ah - Lee Soo-cheon
- ??? - Seo Haeng-ja
- Cho Yeon-jin - Kim Hee-ji
- Lee Min-jae - Jung Eun-ho
- Kang Na-eon - Kang Min-joo
- Go Sung-min - Joo Hee-yeon
- Moon Woo-jin - Kim Yi-joon
- Choi Hyeon-jin - Jung Ji-wook
- Kim Ji-seong - Big Mother
- Jung Hee-tae - Big Father
- Kim Kwang-kyu - Principal
- ??? - Gabriel
- Go Seung Bo - Kyeong-tae
- ??? - Han Ga-yeon
- Lee Ju-won - Homeroom Teacher
- Jung Yi-rang - Yeo-reum's Mother
- Jeon Seok-chan - Yeo-reum's Father
- ??? - Choi Seol-ae
- Heo Jin - Wang Ae-ryung
- Heo Jin - [Kyung Joo's grandmother]
- Kim Min-a - Chil-bun
- ??? - Director
- Choi Kyo-sik - Butler
- ??? - Cha Seok Jin
- Chae Won-been - Kang Kyung Joo
- Park Sung-jun - Kwang Ryeol
- Nam Joong-gyu - Min Kyu
- Han Ye-ji - Ji Soo
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