Composer
Director
Screenwriter
Main Role
- Lim Soo Jung Main Role
- Lee Do Hyun Main Role
- Jin KyungNoh Jung AhMain Role
- Choi Dae HoonRyu Sung JaeMain Role
Support Role
- Oh Gwang RokJi Hyeon Uk [Yun Su's father]Support Role
- Woo Da ViSung Ye Rin [Min Joon's and Hye Mi's daughter]Support Role
- Jang Hyun SungSung Min Joon [National assemblyman]Support Role
- Byun Jung SooYoo Hye Mi [Min Joon's wife]Support Role
- Kim Ho JinBaek Min Shik [Seung Yoo's father]Support Role
- Baek Ji WonMin Hee Seung [Seung Yoo's mother]Support Role
- Choi Woo SungJang Kyu Young [Asung High School student]Support Role
- Shin Soo YunChoi Si AnSupport Role
- Lee Yoo JinSung Yoo Chan [Ye Rin's brother]Support Role
- Kim Ji YoungKim Ji Na [Noh Jung Ah's daughter]Support Role
- Oh Hye WonNoh Yeon Woo [Asung Middle School principal]Support Role
- Jang GwangNoh In Hyeong [Asung School chairman]Support Role
- Ahn Sang WooHan Myeong Jin [Asung High School math teacher]Support Role
- Yang Jo AhKim Jin Hee [Ahsung High School teacher]Support Role
- Kim Mi HyeAh Sung Go [Asung High School math teacher]Support Role
- Lee Kang JiLee Hyun Jae [Seung Yoo's friend]Support Role
- Lee Sang JinPark Hyung Do [Seung Yoo's friend]Support Role
- Kyung Ki HyunIl Woo [Seung Yoo's friend]Support Role
- Lee Se NaJo Yoon ASupport Role
- Son Jin HwanOh Jin Taek [Asung High School principal]Support Role
- Jeon Jin KiChoi Seong Han [Asung High School assistant principal]Support Role
- Lee Tae HyungIm Hyeong Bin [Sammu Academy director]Support Role
- Kwon Hyuk SooJung Il Young [Minister of Eduction]Support Role
- Park YongShin Seung Jae [Vice Minister]Support Role
- Song Kyung Hwa[Student's mother]Support Role
- Jo Seung Yeon[Student's mother]Support Role
- Bo Ra Na[Student's mother]Support Role
- Park Sung YunYoo Sun A [Kyu Young's mother]Support Role
- Han Ki JoongRyu Hyeon Il [Sung Jae's father] (Ep. 6)Support Role
- Lee Ji AnPark So JungSupport Role
Guest Role
- Kang Du Hyun[Rubik's Pyramid boy] (Ep. 1)Guest Role
- Oh Kyu Taek[Student's father] (Ep. 1)Guest Role
- Min Jung Sup[Detective] (Ep. 1)Guest Role
- Lim Jung Min[Security guard] (Ep. 1)Guest Role
- Lee Chang[Teacher] (Ep. 2)Guest Role
- Jo Young Mi[In Hyeong's maid] (Ep. 2)Guest Role
- Hong Eun Jeong[Bridal shop employee] (Ep. 3)Guest Role
- Jang Ho Joon[Student] (Ep. 3)Guest Role
- Seo Jeong Hoo[Student affairs staff] (Ep. 3)Guest Role
- Chu Yeon Gyu[Ahsung High School teacher] (Ep. 3-4, 6, 9-10)Guest Role
- Jeon Guk HyangShin Kyung In [Sung Jae's mother] Aunt (Ep. 3, 5-6, 12)Guest Role
- Paul BattleAdolf Miller [Professor] (Ep. 4)Guest Role
- Yeo Woon BokCha Sung Won (Ep. 4-5)Guest Role
- Garrison Michael Farquharson-Keener[Professor] (Ep. 4-5)Guest Role
- Choi Seung HoonBaek Seung Yoo / Baek Min Jae [Young] (Ep. 4-5)Guest Role
- Lee Eun Ju[Vice Minister Shin's wife] (Ep. 4, 6)Guest Role
- Lee Go EunSung Ye Rin [Young] (Ep. 5)Guest Role
- Kim Jin GooKim Han Chul (Ep. 5)Guest Role
- Park Ji Ho[Reporter] (Ep. 5)Guest Role
- Lee Joo Young[Nurse] (Ep. 5)Guest Role
- Han Ho Yong[Photography studio employee] (Ep. 5)Guest Role
- Park Jin YoungMs. Lee (Ep. 6)Guest Role
- Song Si AnJi Yoon Soo [Young] (Ep. 6)Guest Role
- Park Yoon YoungNo Yeon Woo [Young] (Ep. 6)Guest Role
- Ahn Chan Woong[No Yeon Woo's secretary] (Ep. 6)Guest Role
- Sung Chan Ho[Speaker] (Ep. 6)Guest Role
- Hwang Soo Min[News program host] (Ep. 6-7)Guest Role
- Park Chul MinKim Sang Wook (Ep. 6-7)Guest Role
- Yang Ha Yoon[TNN reporter] (Ep. 7)Guest Role
- Kim Oh Bok[Moderator] (Ep. 7)Guest Role
- Lee Chae Min[Boarding school staff] (Ep. 7)Guest Role
- Seo Hye Jin[Sanatorium nurse] (Ep. 7)Guest Role
- Lee Yoon SangMinister Kyung Woo Min (Ep. 7, 11-12)Guest Role
- Kwak Myung Hwa[Minister Kyung Woo Min's Wife] (Ep. 7- 8, 11-13)Guest Role
- Seon Woo[Jenny's mother] (Ep. 7-8, 12-13)Guest Role
- Lee Da YeonKyung Soo Young (Ep. 7-10, 12-14)Guest Role
- So A RinAhn Jenny (Ep. 7-10, 12-14)Guest Role
- Kang Moon Kyung[Professor] (Ep. 7, 16)Guest Role
- Kim Bong Soo[Janggi match onlooker] (Ep. 8)Guest Role
- Kim Hae Gon[Real estate agent] (Ep. 8)Guest Role
- Lee Dong Chan[Janggi match onlooker] (Ep. 8Guest Role
- Lee Jae WooPark Si Hyung [Police officer] (Ep. 8)Guest Role
- Jo Hye Sun[Sammu Academy staff] (Ep. 8-9)Guest Role
- Hong Seong Gwan[Security room staff] (Ep. 9)Guest Role
- Bae Yoo Ri[Restaurant hostess] (Ep. 9-10)Guest Role
- Lee Dong Kyu[TNN anchorman] (Ep. 10)Guest Role
- Oh Seung Chan[Doctor] (Ep. 10)Guest Role
- Jang Eui Don[Prosecutors' office staff] (Ep. 10)Guest Role
- Lee Ji Young[Book signing photographer] (Ep. 11)Guest Role
- Jun Joon Woo[UTN reporter] (Ep. 12-13)Guest Role
- Yook Hyun Suk[Reporter] (Ep. 12-13, 15)Guest Role
- Hwang Joo HoAttorney Jang (Ep. 13)Guest Role
- Kim Myung Joong[Asung Foundation Board member] (Ep. 13)Guest Role
- Park Shin Woon[Detective] (Ep. 13-14)Guest Role
- Yun Ki Chang[Detective] (Ep. 13-14)Guest Role
- Yook Mi Ra[Yeon Woo's Aunt (Ep. 13-15)Guest Role
- Park Se Hoon[Detective] (Ep. 14)Guest Role
- Seol Chang Hee[Ryu Sung Jae's contact] (Ep. 14)Guest Role
- Lee Seo YulMr. Ahn (Ep. 14, 16)Guest Role
- Yoo Ji Hyuk[Detective] (Ep. 15)Guest Role
- Shin Won Woo[Prosecutors' office staff (Ep. 15)Guest Role
- Yoon Dan Bi[Nurse] (Ep. 15)Guest Role
- Min Sang Chul[Doctor] (Ep. 15)Guest Role
- Choi Yi Sun[Reporter] (Ep. 15-16)Guest Role
- Bae Ha Neul[Doctor] (Ep.5)Guest Role
- Kim Sang JiShin So MinGuest Role
- Kaare Svejgaard Olsen[MIT professor] (Ep. 4-5)Guest Role
- Lee Yu Ju[Train passenger] (Ep. 1)Guest Role
- Kim Joon HoKim Jun HoGuest Role
- Hwang Ji ALee Hyun Seo (Ep. 16)Guest Role
- Lee Ji Woo[Orphanage girl] (Ep.9)Guest Role
- Park Hee JungPark Hye Young (Ep. 6, 11)Guest Role
- Shin Ga Ram[Student]Guest Role
- Kim Seo Won[Prosecutor's office staff] (Ep. 15)Guest Role
- Yu Seung Il[Prosecutor] (Ep. 16)Guest Role
- Lee Sung Il[Prosecutor] (Ep. 16)Guest Role
- Ko Kyung Man[Prosecutor] (Ep. 16)Guest Role
- Lee Ji Su[Prosecutor] (Ep. 16)Guest Role
- Kim Yoon Seol[Student] (Ep. 16)Guest Role
- Go Seung Bo[Student] (Ep. 16)Guest Role
- An Seong Won[Student] (Ep. 16)Guest Role
- Seo Hee[Award ceremony staff] (Ep. 16)Guest Role
- Lee Jong Goo[Professor] (Ep. 16)Guest Role
- Park Road[Student]Guest Role
- Cho Hyun Min Guest Role
- Lee Na Bin Guest Role
Unknown
- Kang Pil Jun Unknown
- Lee Hyun So Unknown
- Kim Tae Woo Unknown
- Shin Ki Hwan Unknown
- Ahn Young Hoon Unknown
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