Director
Editor
Screenwriter
Main Role
- Seo Hyun Jin Main Role
- Ra Mi Ran Main Role
- Ha Joon Main Role
- Lee Chang Hoon Main Role
Support Role
- Jung Hae Kyun Support Role
- Jo Yun Hee Support Role
- Kang Shin HaJi Yoo Sung [Teacher / Administration Department]Support Role
- Jang Da KyungShim Gi Joo [Teacher / Administration Department]Support Role
- Park Ya SungPark Jung Min [Teacher / Administration Department]Support Role
- Park Ji HwanSong Young Tae [3rd Grade senior teacher / Head of Senior Class Group]Support Role
- Heo Tae HeeHa Soo Hyun [Korean teacher / Senior Class Group]Support Role
- Yoo Min KyuJi Hae Won [Short-term teacher / Senior Class Group]Support Role
- Lee Sae Ro MiEun Young [Teacher / Senior Class Group]Support Role
- Ahn Sang EunJang Hee Soo [Short-term teacher / Jae Ho's niece / Senior Class Group]Support Role
- Lee Jang WonSon Dong Ha [After school program head teacher and geographic teacher]Support Role
- Lim Hyun SungYoo Jae Ho [Director of administration]Support Role
- Lee So JinLee So Jin [Administration office]Support Role
- Kim Hong PaByun Sung Joo [Principal of Daechi high school]Support Role
- Lee Yoon HeeLee Seung Taek [Vice principal of Daechi high school]Support Role
- Ye Soo JungYoon Yeo Hwa [Career consultant teacher]Support Role
- Woo Mi HwaHan Jae Hee [Math and creative experience teacher]Support Role
- Kim Seung HoonCha Tae Ho [Director of Information mathematics and orthodoxy]Support Role
- Park Ji HoonGoo Jae Hyun [Student in Ha Neul's class]Support Role
- Lee Eun SaemJin Yoo Ra [Student in Ha Neul's class]Support Role
- Jung Taek HyunHwang Bo Tong [Student in Ha Neul's class]Support Role
- Lee Hang Na Support Role
- Kim Jung Young Support Role
- Maeng Sang Hoon Support Role
- Kim Hak SeonYeo Se Chang [Sung Soon's husband]Support Role
- Noh Yi HanYeo Ha Rang [Sung Soon's son]Support Role
- Lee Dong GyuKim Kyung Min [Gangnam High School admissions]Support Role
- Lee Jae SungLee Chan YoungSupport Role
Guest Role
- Baek Seo YunGo Ha Neul [11-years-old]Guest Role
- Tae In Ho Guest Role
- Lee Hyun Kyun[Ha Neul's high school teacher] (Ep.1)Guest Role
- Kil Hae Yeon[Young Ha's mother] (Ep. 1)Guest Role
- Ok Joo Ri[Store owner] (Ep. 1)Guest Role
- Kwon So HyunSong Ji Sun [Korean language teacher] (Ep.1-5, 16)Guest Role
- Seo Jung Yeon[Ji Yun's mom] (Ep.2)Guest Role
- Kim Jung SooPrincipal Gang [High school principal] (Ep.3)Guest Role
- Park Jin Yeong[High school principal] (Ep. 3)Guest Role
- Yoo Young Bok[Gangnam High school principal] (Ep.3)Guest Role
- Choi MinHan Se Wol (Ep. 3-4)Guest Role
- Jo Young SeonPark Sung Soon [Teen] (Ep.4)Guest Role
- Baek Eun HyeSong Chan Hee [Administration officer] (Ep.5, 8-9)Guest Role
- Lee Jung Hoon[Jae Hyun's father] (Ep.5-6, 9-10)Guest Role
- Kim Byung ChunPark Young Suk [Korean teacher] (Ep.7-8)Guest Role
- Han Song Ho[Reporter] (Ep.10-11)Guest Role
- Kim Jong Goo[Chairman of Daechi High School] (Ep. 12)Guest Role
- Eun Seo YoolJung Da Hyun [New Teacher] (Ep.12-14)Guest Role
- Park Yoo RimRyu Jin Hee [New Teacher] (Ep.13)Guest Role
- Seo Hye Jin[Ha Rang's teacher] (Ep.13)Guest Role
- Jo Yeong Jin[Bo Tong's father] (Ep.15)Guest Role
- Ahn Soo Bin[Ha Neul's acquaintance] (Ep. 15-16)Guest Role
- Ahn So RimYang Da SolGuest Role
- Lee Haeng SeokMr. Joon Suk [Teacher]Guest Role
- Han Hye Ji[Teacher]Guest Role
- Jang Eui Don[Dean of students]Guest Role
- Min Sang Woo[School Administration employee]Guest Role
- Kyung Ki Hyun[Student]Guest Role
- Richard Kim[School Guard]Guest Role
- Chu Yeon Gyu[Private institute teacher] (Ep.5)Guest Role
- Han Ji Eun[Teacher]Guest Role
- Lim Jung Min Guest Role
- Park Se Hoon[Police officer #1]Guest Role
- Ryu In AGo Ha Neul [Teen]Guest Role
- Hwang Sun Young[Nutritionist]Guest Role
- Kwak Na Yeon[Parent]Guest Role
- Hwang Bo Kwon[Consulting man]Guest Role
- Jang Ho Joon[Student] (Ep. 14)Guest Role
- Kim Jong Ho[Teacher]Guest Role
- Oh Se Eun[Student] (Ep. 6)Guest Role
- Lee Kyung Oh[Student's father]Guest Role
- Kim Mi HyeHa Mi Hye (Ep. 1)Guest Role
- Park So Young[Staff]Guest Role
- Kim I San[Admission officer]Guest Role
- Jeon Mi Do[College Admission Officer] (Ep.5)Guest Role
- Kim Kyung MinIn Hyun BinGuest Role
- Park Mi SaeIn Hyeon BinGuest Role
- Kang Sung Chan[High school student]Guest Role
Unknown
- Shin Ji Yeon Unknown
- So A Rin Unknown
- Han Ji Won Unknown
- Lee Jae In Unknown
- Jung Sang Hyun Unknown
- Park Woo Young Unknown
Bit part
- Hwang Hyun Jeong Bit part
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