Director
Screenwriter
Main Role
- Lee Yo WonLee Eun PyoMain Role
- Choo Ja HyunByun Chun HeeMain Role
- Kim Gyu RiSeo Jin HaMain Role
- Jang Hye JinKim Young MiMain Role
- Joo Min KyungPark Yoon JooMain Role
Support Role
- Choi Jae RimJung Jae Woong [Eun Pyo's husband]Support Role
- Jung Shi YoolJung Dong Seok [Eun Pyo's son]Support Role
- Lee Chae HyunJung Dong Joo [Eun Pyo's son]Support Role
- Choi Deok MoonKim Joo Seok [Chun Hee's husband]Support Role
- Joo Ye RimKim Yoo Bin [Chun Hee's daughter]Support Role
- Kim Seo JunKim Young Bin [Chun Hee's son]Support Role
- Choi Kwang RokLuis Bunuel [Jin Ha's husband]Support Role
- Shin Seo WooHenry Bunuel [Jin Ha's son]Support Role
- Im Su HyungOh Geon Woo [Young Mi's husband]Support Role
- Ahn Seok HyunO Jul Pin [Yeong Mi's son]Support Role
- YunaOh Sae Bom [Young Mi's daughter]Support Role
- Yoon Gyung HoLee Man Su [Yoon Ju's husband]Support Role
- Park Ye RinLee Soo In [Yoon Joo's daughter]Support Role
- Lee Ji HyunHwang Jung Sook [Teacher]Support Role
- Shim So YoungHousekeeper NamSupport Role
- Kang Ji YongSong Jae BinSupport Role
- Joo In Young[Jae Bin's mother]Support Role
- Kim Ka EunMin JiSupport Role
- Jeon Soo Ji[Min Ji's mother]Support Role
- Oh Hee JoonOh Dong Shik [Detective]Support Role
- Kim Jung HoonCha Hyuk Ho [Detective]Support Role
- Na Hyun WooJang Won Tae [Chun Hee's acquaintance]Support Role
Guest Role
- Ko Na Young[Mover] (Ep. 1)Guest Role
- Richard Kim[University faculty] (Ep. 1)Guest Role
- Kim Sung Nyeo[Eun Pyo's mother-in-law] (Ep. 1, 3-4, 10)Guest Role
- Oh RyoongHan Sung Bum [HSB Academy Speaker] (Ep. 1, 9, 11)Guest Role
- Oh Man SeokLee Young Goon [Professor] (Ep. 1, 5, 15-16)Guest Role
- Lee Soo Mi[Bakery employee] (Ep. 1, 6-7, 15-16)Guest Role
- Jeon Seok Chan[Eun Pyo's brother] (Ep. 2)Guest Role
- Lee Da KyungLee Eun Pyo [Young] (Ep. 2-3, 5)Guest Role
- Yoon Chae EunSeo Jin Ha [Young] (Ep. 2-3, 5, 11) | Rhea Benuel [Young] (Ep. 15)Guest Role
- Sung Byung SookHyung Im [Eun Pyo's mother] (Ep. 3, 5, 9-10, 16)Guest Role
- Park Na EunSo Young (Ep. 3)Guest Role
- Hong Dae Sung[Detective] (Ep. 3)Guest Role
- Min Dae Shik[Interviewer] (Ep. 3)Guest Role
- Choi Sol Hee[Doctor] (Ep. 3-4)Guest Role
- Woo Jeong WonYun Mi [Alumnae] (Ep. 3, 5)Guest Role
- Park Min Young[Alumnae] (Ep. 3, 5)Guest Role
- Lee Seon HeeBang Jung Hee [Sungmyung Chairman] (Ep. 3, 9-10, 13)Guest Role
- Han Ji AnLuis Benuel [Young] (Ep. 4)Guest Role
- Jun Jung Il[Contest judge] (Ep. 4)Guest Role
- Jang Yoon Woo[Award ceremony MC] (Ep. 4)Guest Role
- Park Jin AhPark Yoo Jin [CCI Gifted Academy teacher] (Ep. 4, 9)Guest Role
- Choi Jae YoungChoi Jae Seok (Ep. 4,9)Guest Role
- Kim Ji Na[Nurse] (Ep. 5)Guest Role
- Lee Yeon Joo[Museum staff] (Ep. 5)Guest Role
- Park Soo Jin[Gifted school interviewer] (Ep. 6)Guest Role
- Seo Jung YeonSu Hyeon [Jin Ha's stepmother] (Ep. 5-8, 11)Guest Role
- Hwang Jung Yoon[Library woman] (Ep. 7)Guest Role
- Jung Hye Kyung[Grocery store customer] (Ep. 7)Guest Role
- Lee Eun Ju[Sangwe Elementary School administration member] (Ep. 7)Guest Role
- Seo Kwang Jae[Sangwe Elementary School administration member] (Ep. 7)Guest Role
- Kim Ah Ram[Nurse] (Ep. 7, 9)Guest Role
- Ahn So Ye[CCI Gifted Academy student] (Ep. 8)Guest Role
- Yoon Jung Ro[Geoseong staff] (Ep. 8)Guest Role
- Kim Do Yeon[Soo In's aunt] (Ep. 8-9)Guest Role
- Heo Ji Na[CCI Gifted Academy director] (Ep. 8-9, 11)Guest Role
- Joo Bo BiMin Yoo Joo [Genius Kid Show Writer] (Ep. 8, 10)Guest Role
- Do Mi Yeon[Nurse] (Ep. 9)Guest Role
- Ha Ji Eun[Joo Seok's sister] (Ep. 9)Guest Role
- Choi Sun Ja[Joo Seok's mother] (Ep. 9)Guest Role
- Kang Jung Yun[Yoon Joo's relative] (Ep. 9)Guest Role
- Noh Seung Jin[Soo In's grandfather] (Ep. 9)Guest Role
- Kim Jang Hwan[Math competition award ceremony host] (Ep. 9)Guest Role
- Choi Soo ImShin Yoo Na (Ep. 9-10, 12, 15)Guest Role
- Min Yong Jin[TV program host] (Ep. 10)Guest Role
- Cha Young Mi[Diner] (Ep. 10)Guest Role
- Kwak Na Yeon[Diner] (Ep. 10)Guest Role
- Lim Seung Beom[Hospital staff] (Ep. 10)Guest Role
- Jo Ha Seok[Detective] (Ep. 10, 14)Guest Role
- Kim Hye Jung[Chun Hee's mother] (Ep. 10, 14-16)Guest Role
- Lee Yoon JaeSeo In Seo (Ep. 11)Guest Role
- Lee Na Ra[Jin Ha's mother] (Ep. 11)Guest Role
- Kim Bang Sun[Child psychiatrist] (Ep. 11)Guest Role
- Lee Jae Nam[Sports academy instructor] (Ep. 11)Guest Role
- Ahn Hee Joo[Camper] (Ep. 12)Guest Role
- Jin Mo[Won Tae's boss] (Ep. 12, 14)Guest Role
- Ki Hwan[Lawyer] (Ep. 13)Guest Role
- Son Joo Yeon[Mother] (Ep. 13)Guest Role
- Kim Jung Hwan[Sungmyung University professor] (Ep. 13)Guest Role
- Jung Jong Yul[Sungmyung University professor] (Ep. 13)Guest Role
- Park Chae Ik[Sungmyung University professor] (Ep. 13)Guest Role
- Shin Hee Gook[Sungmyung University faculty member] (Ep. 13)Guest Role
- Kim Jin Bok[Geon Woo's colleague] (Ep. 13-14)Guest Role
- Kim Bi Bi[Jun Yong's mother] (Ep. 16)Guest Role
- Lee Ji Hae[Mother]Guest Role
- Yoo Joon A[Mother]Guest Role
- Kim Soo Yeon[Mother]Guest Role
- Byun Joo Woo[Mother]Guest Role
- Kim Ji Su[Assistant instructor]Guest Role
- Jung Sun A[Gifted children speaker] (Ep. 4)Guest Role
- Kim Young Mi[Parent]Guest Role
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