Composer
Director
Screenwriter
Main Role
- Park Eun BinChae Song AhMain Role
- Kim Min JaePark Joon YoungMain Role
- Park Ji HyunLee Jung KyungMain Role
- Kim Sung CheolHan Hyun HoMain Role
Support Role
- Lee Yoo JinYoon Dong YoonSupport Role
- Bae Da BinKang Min SungSupport Role
- Ye Soo JungNa Moon Sook [Head of Kyung Hoo Cultural Foundation]Support Role
- Kim Jong TaeLee Sung Geun [Jung Kyung's father]Support Role
- Seo Jung YeonCha Young In [Performance planner, Kyung Hoo Cultural Foundation]Support Role
- Choi Dae HoonPark Sung Jae [Kyung Hoo Cultural Foundation employee]Support Role
- Yang Jo AhIm Yoo Jin [Kyung Hoo Cultural Foundation employee]Support Role
- Ahn Sang EunJung Da Eun [Kyung Hoo Cultural Foundation employee]Support Role
- Lee Ji WonKim Hae Na [Intern]Support Role
- Kil Hae YeonSong Jong Hee [Seo Ryeong University]Support Role
- Baek Ji WonLee Soo Kyung [Seo Ryeong University]Support Role
- Joo Seok TaeYoo Tae Jin [Piano instructor, Seo Ryeong University]Support Role
- Kim Hak Seon[Song Ah's father]Support Role
- Kim Seon Hwa[Song Ah's mother]Support Role
- Lee No AhChae Song Hee [Song Ah's sister]Support Role
- Kim Jung Young[Joon Young's mother]Support Role
- Han Da MiJang Eun Ji [Song Ah's friend]Support Role
- Song Ji WonSoo JungSupport Role
- Ko So HyunYang Ji Won [Violinist]Support Role
- Kim Gook Hee[Ji Won's mother]Support Role
Guest Role
- Park Ji Ye Guest Role
- Jo Seung YunAhn Nam Goo [Conductor] (Ep. 1)Guest Role
- Jung Ye Na[Restaurant girl asking Song Ah about the violin] (Ep. 1)Guest Role
- Cha Mi Kyung[Maestro] (Ep. 2)Guest Role
- Park Sang HoonPark Joon Young [Young] (Ep. 2-4)Guest Role
- Shin Soo YunLee Jung Kyung [Young] (Ep. 2-4, 15)Guest Role
- Kim Ga Young[Homeroom teacher] (Ep. 2, 4)Guest Role
- Yoon Chan YoungSeung Ji Min [Pianist / Joon Young's rival] (Ep. 3)Guest Role
- Lee Kang WookJoo Sang Wook [Kyunghoo Card] (Ep. 4)Guest Role
- Hong Seo JoonCEO Jo (Ep. 5)Guest Role
- Park Si EunJo Soo An (Ep. 5)Guest Role
- Kim Yoon Seol[Middle school student] (Ep. 5)Guest Role
- Kim Young Sun[Ji Won's mother] (Ep. 5-6)Guest Role
- Park Seung Tae[Bus passenger] (Ep. 7)Guest Role
- Choi Hee JinLee Doo Ri [Reporter] (Ep. 8, 14)Guest Role
- Kim Yi Rin[High school alumni] (Ep. 9)Guest Role
- Jo Deok Hee[High school alumni] (Ep. 9)Guest Role
- Shin Hee Gook[High school alumni] (Ep. 9)Guest Role
- Jang Young Hyun[High school alumni] (Ep. 9)Guest Role
- Park Jin Young(Ep. 10)Guest Role
- Lee Do HyeKim Kyu Hee (Ep. 11)Guest Role
- Kim Gyu BinLee Jung Kyung [Young] (Ep.11)Guest Role
- Woo Hee JinJung Kyung Sun [Jung Kyung's mother] (Ep. 11)Guest Role
- Han Hye Ji[Faculty] (Ep. 12, 15)Guest Role
- Garrison Michael Farquharson-KeenerChris [Manager]Guest Role
- Ki Eun YooPark Joon Young [Young]Guest Role
- Lee Chae Hyun[Park kid]Guest Role
- Rachel J. Goodgion[Devoted fan]Guest Role
- Kim Su Ol Guest Role
- Kim Dong Hyun Guest Role
- Lee Jin Na[Student in Seoryeong University]Guest Role
- Lee Myung Joon[Practice room student]Guest Role
- Hwang Sun Young[Alumni president]Guest Role
- Shin Ui JungCecilia [Pianist] (Ep. 8, 11)Guest Role
Bit part
- Kim Nam Jin[Hyun Ho's mother] (Ep. 7)Bit part
Unknown
- Kim Cha Yoon Unknown
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