Composer
Director
Screenwriter
Main Role
- Shin Hye Sun Main Role
- Yang Se JongGong Woo JinMain Role
- Ahn Hyo SeopYoo ChanMain Role
- Ye Ji WonJennifer / Hwang Mi Jung [Mysterious housekeeper]Main Role
Support Role
- Wang Ji WonKim Tae Rin [Violinist, music director]Support Role
- Yoon Sun WooKim Hyung Tae [Neurology resident]Support Role
- Jung EugeneKang Hee Soo [Woo Jin's boss]Support Role
- Yoon Chan YoungGong Woo Jin [Young]Support Role
- Park Si EunWoo Seo Ri [Young]Support Role
- Lee Ah HyunGong Hyun Jung [Woo Jin's sister]Support Role
- Ahn Seung GyunJin Hyun [Design staff]Support Role
- Jo Hyun Shik Support Role
- Lee Do HyunDong Hae Beom [Chan's friend]Support Role
- Lee Seung JoonKim Hyun Kyu [Seo Ri's uncle]Support Role
- Shim Yi YoungKook Mi Hyun [Seo Ri's aunt]Support Role
- Kim Min SangYoo Joong Seon [Psychologist]Support Role
- Im Byung KiGong Yong Hwan [Gong Woo Jin's father]Support Role
- Jo Yoo JungLee Ri An [Taesan High, crush on Chan]Support Role
- Park Jong HoonShim Myung Hwan [Conductor, renowned violinist]Support Role
- Lee Seo YeonNo Su Mi [Seo Ri's best friend]Support Role
- Ha Do Gwon[Rowing crew coach]Support Role
Guest Role
- Won Mi Won[Woman in park] (Ep. 11, 13)Guest Role
- Song Ji Hyun[Flower store employee] (Ep. 25-26)Guest Role
- Shin Ji Yeon[Violin academy director]Guest Role
- Kim Baek Ri[Nurse]Guest Role
- Jin Yu Chan[Kid]Guest Role
- Ju Ah Yeon[Part-time worker]Guest Role
- Uhm Hye Soo Guest Role
- Ahn Dong Yeob Guest Role
Bit part
- Joey Albright[Camper] (Ep. 1)Bit part
- Henny Savenije[German audition judge] (Ep. 1)Bit part
- Lee Tae Geom[Hyung Tae's senior] (Ep. 1)Bit part
- Jung Shi Yool(Ep. 3)Bit part
- Lee Joon Hee[Design client] (Ep. 12)Bit part
- Lee Kyung Hoon[Boy on street] (Ep. 22)Bit part
- Wang Seok HyunKim Hyung Tae [Young]Bit part
- Jeon Bae SooWoo Sung Hyun [Seo Ri's father]Bit part
- Jeon Ik RyungKim Hyun Jin [Seo Ri’s mother]Bit part
- Kwon Hyuk SooCEO Park [Design client]Bit part
- Jung Jin WoonJung Jin Woon [Chan’s rival]Bit part
- Son San[Nurse]Bit part
- Seo Yoon AhCEO Kim [Design client]Bit part
- Park Seung TaeWoo Seo Ni [Woman in bar]Bit part
- Jung Ho BinByung Gyu Chul [Festival chairman]Bit part
- Kim Kwang Gyu[Violin repairman]Bit part
- Ji Dae Han[Precinct station police officer]Bit part
- Hong Ki JoonKim Sang Shik [Truck driver]Bit part
- Lee Young Eun[Kim Tae Jin's sister]Bit part
- Seo Yun HyukYoo Chan [Young]Bit part
- Baek Jae Jin[Stage design chief]Bit part
- Ri Min[Teacher at Taesan high school]Bit part
- Jo Yi HyunMin Kyu [Seo Ri's cousin]Bit part
- Park Hyun Jung[Tae Rin's mother]Bit part
- Jung Kyung Cheon[Police precinct]Bit part
- Lee Jin Mok[Security guard at Columbarium]Bit part
- Jo Soo JiKim Tae Rin [Young]Bit part
- Park Yoon Young[Seo Ri's friend]Bit part
- Kim Young JaeKim Tae Jin [Jennifer's husband]Bit part
- Seo Eun YoolYoo Chan [Young]Bit part
- Kim Joo Ah[Shows Seo Ri the free food line]Bit part
- Kim Mi Hye[Nurse]Bit part
- Song Chang Gyu[Chicken restaurant owner]Bit part
- Ok Joo Ri[Cleaning lady at airport]Bit part
- Yoo Ok Joo[Nursing care worker]Bit part
- Sung Hyun Mi[Woman who calls from flyer]Bit part
- Jo Mi Nyeo[Customer at Jennifer's shop]Bit part
- Lee Hyo BiWoo Seo Ri [Young]Bit part
- Lee Yoo Jin[Jazz festival music crew]Bit part
- Kim Min Seo Bit part
- Moon Hak Jin Bit part
- Kim Do Ah Bit part
Unknown
- Shin Soo Hyun Unknown
- Kwon Yoo Na Unknown
- Lee Myung Joon Unknown
- Kim Hye Ran Unknown
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