Do Do Sol Sol La La Sol

Composer

• 
  Park Se Jun

Director

• 
  Kim Min Kyung
• 
  Goo Sung Joon

Screenwriter

• 
  Oh Ji Young

Main Role

• 
  Go A Ra

  Goo Ra Ra

  Main Role
• 
  Lee Jae Wook

  Sun Woo Joon

  Main Role
• 
  Kim Joo Heon

  Cha Eun Seok

  Main Role

Support Role

• 
  Ye Ji Won

  Jin Sook Kyung

  Support Role
• 
  Shin Eun Soo

  Jin Ha Young

  Support Role
• 
  Lee Soon Jae

  Kim Man Bok

  Support Role
• 
  Oh Gi Gwang

  Lee Seung Gi [Ha Yeong's friend]

  Support Role
• 
  Seo Yi Sook

  Jo Yoon Shil [Woo Joon's mother]

  Support Role
• 
  Choi Kwang Il

  Sun Woo Myung [Woo Joon's father]

  Support Role
• 
  Lee Seo An

  Oh Young Joo [Eun Seok's ex-wife]

  Support Role
• 
  Moon Tae Yu

  Bang Jung Nam

  Support Role
• 
  Park Sung Yun

  [Seung Gi's mother]

  Support Role
• 
  Lee Seon Hee

  [Ye Seo's mother]

  Support Role
• 
  Kim Jung Yeon

  Mi Ran [Sook Kyung's friend]

  Support Role
• 
  Choi Kwang Je

  Choo Min Soo [Private detective]

  Support Role
• 
  Song Min Jae

  Shin Jae Min [Ra Ra's student]

  Support Role
• 
  Kang Hyung Suk

  Ahn Joong Ho [Ra Ra's stalker]

  Support Role

Guest Role

• 
  Kong Jin Seo

  Min Ju (Ep. 1)

  Guest Role
• 
  Kim Gyu Ri

  Goo Ra Ra [Teen] (Ep. 1)

  Guest Role
• 
  Park So Yi

  Goo Ra Ra [6-years-old] (Ep. 1, 3)

  Guest Role
• 
  Jeon Soo Kyung

  Im Ja Kyung [Jung Nam's mother] (Ep. 1, 8)

  Guest Role
• 
  Moon Hee Kyung

  Kong Mi Suk [Ra Ra's piano teacher] (Ep. 1-3, 7, 15)

  Guest Role
• 
  Ahn Nae Sang

  Secretary Moon [Man Su's assistant] (Ep. 1, 3, 13)

  Guest Role
• 
  Um Hyo Sup

  Goo Man Su [Ra Ra's father / President of Ra Ra Cosmetics] (Ep. 1, 5)

  Guest Role
• 
  Jang In Ho

  [Detective] (Ep. 1)

  Guest Role
• 
  Song Kyung A

  [Piano judge] (Ep. 1)

  Guest Role
• 
  Kwon Ban Suk

  [Wedding guest] (Ep. 1)

  Guest Role
• 
  Yoo Yong

  [Wedding guest] (Ep. 1)

  Guest Role
• 
  Song Hoon

  [Wedding guest] (Ep. 1)

  Guest Role
• 
  Kim Oh Bok

  [Wedding guest] (Ep. 1)

  Guest Role
• 
  Lee Mi Yoon

  [Real estate agent] (Ep. 1)

  Guest Role
• 
  Kim Hae Gon

  [Real estate agent] (Ep. 1)

  Guest Role
• 
  Kyung Ki Hyun

  [Studio rental clerk] (Ep. 1)

  Guest Role
• 
  Lee Hyun Seo

  [Apartment renter] (Ep. 1)

  Guest Role
• 
  O Gyu Taek

  [Construction foreman] (Ep. 1)

  Guest Role
• 
  Shin Seung Yong

  [Motorcycle deliveryman] (Ep. 1)

  Guest Role
• 
  Baek Young Kwang

  [Choo Min Soo's subordinate] (Ep. 1, 5)

  Guest Role
• 
  Chae Yoo Ri

  Na Gyeom (Ep. 2)

  Guest Role
• 
  Kim Joo Yeon

  Kim Shi Ah [Ra Ra's friend] (Ep. 2-3, 9, 11)

  Guest Role
• 
  Seol Chang Hee

  [Veterinarian] (Ep. 2)

  Guest Role
• 
  Choi Ga In

  [Na Gyeom's mother] (Ep. 2)

  Guest Role
• 
  Kim Jae Cheol

  [Good&Good speaker] (Ep. 2)

  Guest Role
• 
  Seon Yul U

  [Good&Good security] (Ep. 2)

  Guest Role
• 
  Seo Wang Seok

  [Good&Good security] (Ep. 2)

  Guest Role
• 
  Kang Sang Chul

  [Man watching columbarium] (Ep. 2)

  Guest Role
• 
  Won Mi Won

  Shim Sun Ja [Man Bok's wife] (Ep. 3, 8, 11)

  Guest Role
• 
  Jang Eui Don

  [Yacht captain] (Ep. 3)

  Guest Role
• 
  Kim Seo Jun

  [Piano Academy student] (Ep. 3)

  Guest Role
• 
  Yoo Mi Ran

  [Piano Academy owner] (Ep. 3-4)

  Guest Role
• 
  Kim Yong Jin

  [Sandwich shop manager] (Ep. 3-5)

  Guest Role
• 
  Kim Bum Suk

  Kang Min Guk [Detective] (Ep. 4-6)

  Guest Role
• 
  Cha Sang Mi

  [Maid] (Ep. 4, 11)

  Guest Role
• 
  Kim Young Joo

  [Detective] (Ep. 4)

  Guest Role
• 
  Kwon Ki Joo

  [Piano deliveryman] (Ep. 4)

  Guest Role
• 
  Kim Moon Ho

  [Grand opening guest] (Ep. 4)

  Guest Role
• 
  Yoo Tae Joo

  [Eunpo Taekwondo staff] (Ep. 4)

  Guest Role
• 
  Choi Soo Hyun

  [Eunpo Terminal clerk] (Ep. 5)

  Guest Role
• 
  Lee Si Woo

  Kim Ji Hoon (Ep. 6, 14)

  Guest Role
• 
  Lee Seung Hee

  [Clothing store employee] (Ep. 6)

  Guest Role
• 
  Kim Jae Heum

  [Eunpo Terminal convenience store clerk] (Ep. 6)

  Guest Role
• 
  Kim Shi Heon

  [Appliance salesman] (Ep. 7)

  Guest Role
• 
  Jang Joo Yeon

  [Piano Academy parent] (Ep. 7)

  Guest Role
• 
  Min Jung Sup

  Detective Min (Ep. 10)

  Guest Role
• 
  Lee Ji Hae

  Kim So Hyung [Joon's tutor] (Ep. 11-12)

  Guest Role
• 
  Lee Hye Eun

  [Nurse] (Ep. 12)

  Guest Role
• 
  Kim Tae Hoon

  [Doctor] (Ep. 12)

  Guest Role
• 
  Lee Ki Sub

  [Doctor] (Ep. 12)

  Guest Role
• 
  Kwon Eun Bin

  Jung Ga Young (Ep. 13-15)

  Guest Role
• 
  Jang Ga Hyun

  [Actor] (Ep. 13)

  Guest Role
• 
  Heo Seon Haeng

  [New business owner] (Ep. 13)

  Guest Role
• 
  Yoo Joon A

  [Man Bok's daughter-in-law] (Ep. 13)

  Guest Role
• 
  Kim Jong Ho

  [Former owner of piano shop] (Ep. 13)

  Guest Role
• 
  Ahn Soo Bin

  [Jin's beauty salon customer] (Ep. 14)

  Guest Role
• 
  Im Jae Geun

  Mr. Kim

  Guest Role
• 
  Lee Shi Yoo

  [Nurse]

  Guest Role
• 
  Seo Yun Hyuk Guest Role
• 
  Kim Jong Ho

  [Real estate agent] (Ep. 11, 13)

  Guest Role
• 
  Jung Hee Young

  [Street vendor] (Ep. 1)

  Guest Role

Unknown

• 
  Seo Sung Jong Unknown
• 
  Son In Yong Unknown
• 
  Lee Chae Hyun Unknown