Chief Producer
Director
Producer
Screenwriter
Main Role
- Ryeoun Main Role
- Choi Hyun Wook Main Role
- Seol In AhChoi Se Kyeong | On Eun YuMain Role
- Shin Eun SooYoon Cheong AhMain Role
Support Role
- Kim Joo RyoungLim Ji Mi [Cheong Ah's stepmother]Support Role
- Bong Jae HyunHa Eun Ho [Eun Gyeol’s brother]Support Role
- Choi Won YoungHa Yi Chan [Older]Support Role
- Seo Young HeeYoon Cheong Ah [Older]Support Role
- Koo Jun HoeKoo Jun Hyung [Spine9's vocalist]Support Role
- Chun Ho JinViva [Eun Gyeol's mentor]Support Role
- Jung Sang Hoon[Master]Support Role
- Lee Suk HyeongJung Bal San [College student]Support Role
- Lee Su ChanNoh Se Bum [Keyboardist]Support Role
- Oh Hee JunOh Ji HwanSupport Role
- Han MinBae Soo Tak [Spine9’s bassist]Support Role
- Lee So YeonChoi Se Kyeong [Older]Support Role
- Go Doo ShimGo Yang Hee [Lee Chan’s grandmother]Support Role
- Lee Soo MinYoon Sang Ah [Se Kyeong’s friend]Support Role
- Yoon Jae ChanKang Hyun Yul [Bassist]Support Role
- Ahn Do KyuOh Ma Ju [Band manager]Support Role
- Kim Tae WooYoon Gun Hyung [Cheong Ah's father]Support Role
- Kwon Do HyungYoon Joo Yeop [Cheong Ah's stepbrother]Support Role
- Yeon OhJung Ji Oh [Spine9’s drummer]Support Role
- Lee Ha MinLee Shi KookSupport Role
- Kim Ye JiLee Mi RaSupport Role
- Kim Hyung BeomOh Ma Joo [Older]Support Role
Guest Role
- Kim Ji WooHa Eun Ho [Young] (Ep. 1)Guest Role
- Jung Hyun JoonHa Eun Gyeol [Young] (Ep. 1)Guest Role
- Noh Hee Joong[Worker] (Ep. 1)Guest Role
- Kim Moon Ho[Vegetables supplier] (Ep. 1)Guest Role
- Heo Jung Min[Coffee shop manager] (Ep. 1)Guest Role
- Kim Ha EonYeom Byung Ho (Ep. 1-2)Guest Role
- Kim Mi Hwa[Byung Ho’s mother] (Ep. 1-2)Guest Role
- Kyung Ki Hyun[Talent agent] (Ep. 2)Guest Role
- Lee Won Jin[Police officer] (Ep. 2)Guest Role
- Lee Bong Ha[Eun Gyeol's helper] (Ep. 2)Guest Role
- Oh Kyu Taek[Se Kyung's chauffeur] (Ep. 2-3)Guest Role
- Shin Young KyuYong Jun Ki (Ep. 3)Guest Role
- Kim Dong Gyun[Math teacher] (Ep. 3)Guest Role
- Lee Seung Chul[Unhoused man] (Ep. 3)Guest Role
- Jeon Seok Chan[The Day owner] (Ep. 3, 5)Guest Role
- Moon Seo YeonChoi Se Kyung [Young] (Ep. 4)Guest Role
- Oh Hyun KyungShin Ha Young [Se Kyung's mother] (Ep. 4-5)Guest Role
- Cha Young Mi[Maid] (Ep. 4)Guest Role
- Han Ji Eun[Cello instructor] (Ep. 4)Guest Role
- Yoon Hyo Sik[Se Kyung's dad] (Ep. 4)Guest Role
- Park Ho SanChoi Hyun [Baekya Music's owner] (Ep. 5-6)Guest Role
- Kwon Dan AhYoon Cheong Ah [Young] (Ep. 6)Guest Role
- Kim Eui Shin[Store owner] (Ep. 6)Guest Role
- Lee Seol Hee[Yoon Cheong Ah's mother] (Ep. 6)Guest Role
- Kim Hae JunDJ Jun (Ep. 7)Guest Role
- Ryu JinOn Ji Hwan [Adult] (Ep. 7)Guest Role
- Woo Jeong WonYoon Sang A [Adult] (Ep. 7)Guest Role
- Lee Sang HoonAttorney Jang (Ep. 8)Guest Role
- Kim So EunJung Hyun Jung [Nurse] (Ep. 8)Guest Role
- Kim Bong Hee[Hospital patient] (Ep. 8)Guest Role
- Kim Jun Seok[Students' dean] (Ep. 9)Guest Role
- Eom Ji Man[Students' dean] (Ep. 9)Guest Role
- Yoon Do HyunYoon Dong Jin [Older] (Ep. 10)Guest Role
- Kim Jun HyungYoon Dong Jin [Young] (Ep. 10)Guest Role
- Yoo Yi Ha[Cellist student] (Ep. 10)Guest Role
- Lee Moo Nyoung[Restaurant worker] (Ep. 10)Guest Role
- Lee Eun Mi[Liquor store owner] (Ep. 10)Guest Role
- Lee Eun Mi[Liquor store owner] (Ep. 10)Guest Role
- Park Han Sol[Eun Ho's girlfriend] (Ep. 10)Guest Role
- Hong Suk YounJung Soo Bin (Ep. 11)Guest Role
- Park Woo YoungLee Kang Hoon (Ep. 11)Guest Role
- Jung Yong JuJung Do Jin (Ep. 11, 15)Guest Role
- Do Geon Wu[Gang member] (Ep. 11)Guest Role
- Lee Dong Gi[Gang member] (Ep. 11)Guest Role
- Jin Hui Gyu[Incarcerated juvenile] (Ep. 11)Guest Role
- Lee So HeeJi Min (Ep. 13)Guest Role
- Jung Kyu SooKang Joong Man [Principal] (Ep. 13)Guest Role
- Jun Jung Il[Taxi driver] (Ep. 13)Guest Role
- Kang Yi Suk[Dongwon High student] (Ep. 13)Guest Role
- Byun Gun Woo[Convenience store cashier] (Ep. 13)Guest Role
- Moon Hyeon Jeong[Maid] (Ep. 14)Guest Role
- Kim So Min[Sidewalk boy] (Ep. 15)Guest Role
- Ryu Soo YoungLee Si Guk [Older] (Ep. 16)Guest Role
- Jin Tae HyunNo Se Bum [Older] (Ep. 16)Guest Role
- Song Chang EuiKang Hyun Yul [Older] (Ep. 16)Guest Role
- Baek Seung Hyun[Detective] (Ep. 16)Guest Role
- Yoo Soo AhJi Hye SooGuest Role
- Choi Yoon WooYoon Joo Yeob [Young]Guest Role
- Park Jung HoonLee Jong Kwan [Astronomical department]Guest Role
- Shin Young Chan[Boarder]Guest Role
- Yoon Dong Hwan[Boarder]Guest Role
- Yoon Jung Hoon[Music teacher]Guest Role
- Lee Sae Byul[PR team leader]Guest Role
- Jung Kang Hee[Club Spark boss]Guest Role
- Park Sun Woo Guest Role
- Kim Hee Sung Guest Role
Unknown
- Kim Ji Yeon Unknown
- Yoo Da Hye Unknown
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