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