Director
Screenwriter
Main Role
- Kim Jae Wook Main Role
- Krystal Jung Main Role
Support Role
- Yoo In YoungBaek Soo YoungSupport Role
- Im Won HeePark Yang TaeSupport Role
- Park Han SolChu Ok Hee [Shin A's bestie]Support Role
- Yoon San HaLee Soo Ho [Shin A's brother]Support Role
- Jung Sung HoKim Cha Bae [GoTop Korean instructor]Support Role
- Kim Ki NamGong Hee Cheol [GoTop Social Studies instructor]Support Role
- Lee Ji MinMichelle Lee [GoTop English instructor]Support Role
- Baek Joo HeeMa Eun Jung [GoTop research assistant]Support Role
- Lee Mi YoungGong Pil Sun [GoTop cleaner]Support Role
- Lee Yoon HeeHwang [Bldg. security guard]Support Role
- Lee Bum KyuLee Beom Gyu [GoTop staff]Support Role
- Joe InKim Hye Sun [GoTop ex-secretary]Support Role
- Song Ji SooPark Eun Hee [GoTop ex-secretary]Support Role
- Moon Seo YoonLee So Ra [GoTop ex-secretary]Support Role
- Lee Si EonKang Min [GoTop ex-employee]Support Role
- Kim Hak SeonLee Yong Gu [Shin A's father]Support Role
- Go Gyu PilJoo Jun Pal / "John"Support Role
- Seo Ji HooJo Jong Oh [Soo Young's Secretary]Support Role
- Son Ki Chul[GoTop Teaching assistant]Support Role
- Kim Ji Yoon[GoTop staff]Support Role
Guest Role
- Ju Su Min[Gotop Education staff]Guest Role
- Kim Jin Ok[Student's mother] (Ep. 1)Guest Role
- Kang Hak Soo[Special lecture staff] (Ep. 1)Guest Role
- Kim Su Kyung[Nurse] (Ep. 1, 7)Guest Role
- Park Jong MooHan Ji Ho [Doctor] (Ep. 1-2, 7, 12)Guest Role
- Bae Gi BeomYoo Jae Ho [Doctor] (Ep. 2-3)Guest Role
- Heo Seon Haeng[Baekga University professor] (Ep. 2)Guest Role
- Lee Jae Woo[Baekga University professor] (Ep. 2)Guest Role
- Yoon Sung Won[Detective] (Ep. 2-3)Guest Role
- Yoon Tae Soo[Detective] (Ep. 2-3)Guest Role
- Jang Se Won[Se Gi's secretary] (Ep. 2-3)Guest Role
- Hong Ye Ji[Nurse] (Ep. 2-4)Guest Role
- Choi Dae ChulBae Byun Ho [Lawyer] (Ep. 3)Guest Role
- Kim Hyun Tae[Resident] (Ep. 3)Guest Role
- Park Joon Soo[Resident] (Ep. 3)Guest Role
- Lee Yeon Joo[Hotel receptionist] (Ep. 3)Guest Role
- Tae In HoLee Dae Seok [Reporter] (Ep. 3-4)Guest Role
- Shin Jun Chul[Interviewer] (Ep. 4)Guest Role
- Lee Dong Kyu[Moderator] (Ep. 5)Guest Role
- Jun Jung Il[Driver on call] (Ep. 5)Guest Role
- Bae Sung Il[Police officer] (Ep. 6)Guest Role
- Moon Hyung Chul[Yong Gu's friend] (Ep. 6-7)Guest Role
- Park Young Bok[Yong Gu's friend] (Ep. 6-7)Guest Role
- Han Myung Hwan[Floral deliveryman] (Ep. 6-7)Guest Role
- Yoon Sa BongHong Yeo Sa [Yang Tae's wife] (Ep. 6, 10)Guest Role
- Shim Won CheolChu Moon Sik [Yong Gu's friend / Ok Hee's Father] (Ep. 6-7, 11)Guest Role
- Kim Bong Hee[Go Jin's grandma] (Ep. 6-7, 10-11)Guest Role
- Moon Joo WonNoh Go Jin [Child] (Ep. 6-7, 10-11)Guest Role
- Park Pal YoungBaek [Soo Young's father / Chairman] (Ep. 7)Guest Role
- Koo Min Hyuk[Taxi driver] (Ep. 7)Guest Role
- Hong Suk Youn[Patient's father] (Ep. 7)Guest Role
- Kim Jung Soo[Judge] (Ep. 8)Guest Role
- Ha Young Jin[Police officer] (Ep. 8)Guest Role
- Baek Kil Sung[Chairman Baek's secretary] (Ep. 9)Guest Role
- Ho Sol Hee[Go Jin's fan] (Ep. 10)Guest Role
- Yoon Hye RiNa Soo Yeon [GoTop ex-employee] (Ep. 11, 13-15)Guest Role
- Kang Moon Kyung[Shareholder] (Ep. 12-14)Guest Role
- Kim Bong SooOh Se A [Se Gi's father] (Ep. 12, 16)Guest Role
- Kim In KyungOh Hee Seok [Shin Ah's friend] (Ep. 13)Guest Role
- Lee Ji Young[Reporter] (Ep. 13)Guest Role
- Park Chul MinSon Sang Won [Reporter] (Ep. 14)Guest Role
- Kim Mi RaLee Soo Yeon [Interviewee] (Ep. 14)Guest Role
- Yong Jin[Detective] (Ep. 14)Guest Role
- Kim Do Hyung[Detective] (Ep. 14)Guest Role
- Yoon Sung Woo[Hye Sun's son] (Ep. 14)Guest Role
- Lee Dong Wook[CCTV Installer] (Ep. 14)Guest Role
- Jung Shin HyeOh Se Hee [Se Gi's sister] (Ep. 14-16)Guest Role
- Park Chan Woo[Detective] (Ep. 15)Guest Role
- Na Mi Hee[Student's upset mother] (Ep. 15)Guest Role
- Jang Eui Don[Master Education CEO] (Ep. 15)Guest Role
- Joo Seung Do[Master Education teacher] (Ep. 15)Guest Role
- Kim Do WonKim Do Yoon [Eun Jung's son] (Ep. 16)Guest Role
- Lim Seung Soo[Child]Guest Role
- Oh Hae Joo[Dept. store saleswoman] (Ep. 6)Guest Role
- Kaare Svejgaard Olsen[Business meeting executive] (Ep. 2)Guest Role
- Lee Ye Ji[Gotop Education staff]Guest Role
- Ko Dong Ok[Reporter] (Ep. 4)Guest Role
- Han Ah Reum[Shin A's friend] (Ep. 13)Guest Role
- Kim Tae Eon[Go In fan] (Ep. 1)Guest Role
- Lee Ju Mi[Student’s mom] (Ep. 1)Guest Role
- Park Seung A[Go Jin's fan] (Ep. 10)Guest Role
- Jang Yoo Hwa[Department store staff] (Ep. 6)Guest Role
- Kim Jin Kyu[Yang Tae's assistant]Guest Role
- Park Jeong Gon[Noh GoJin fan] (Ep. 1)Guest Role
- Yun Ho Rim[Bartender] (Ep. 7)Guest Role
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