Moon River

Composer

• 
  Park Se Jun

Director

• 
  Lee Dong Hyeon

Executive Producer

• 
  Kwon Sung Chang

Screenwriter

• 
  Jo Seung Hee

Main Role

• 
  Kang Tae Oh

  Crown Prince Yi Gang

  Main Role
• 
  Kim Se Jeong

  Park Dal I

  Main Role
• 
  Lee Shin Young

  Yi Un

  Main Role
• 
  Hong Su Zu

  Kim U Hui

  Main Role
• 
  Jin Goo

  Kim Han Cheol

  Main Role

Support Role

• 
  Kim Nam Hee

  Yi Hui [King of Joseon]

  Support Role
• 
  Kwon Joo Seok

  O Sin Won [Left commander of Ikwisa]

  Support Role
• 
  Han Sang Jo

  Yun Se Dol [Gang's personal eunuch]

  Support Role
• 
  Kim Yun Bae

  Cha Eun U [Hanyang merchant guild's apprentice]

  Support Role
• 
  Park Ah In

  Park Hong Nan [Merchant guild's head]

  Support Role
• 
  Nam Gi Ae

  Queen Dowager Han

  Support Role
• 
  Choi Deok Moon

  Heo Yeong Gam [Former naval commander]

  Support Role
• 
  Kim Joong Ki

  Kim Ja Gyeong [Minister of personnel]

  Support Role
• 
  Yang Jae Young

  Kim Hong Ro [Minister of war]

  Support Role
• 
  Song Ji Hyun

  Yeo Ri [U Hui's servant]

  Support Role
• 
  Tak I On

  Tak I [Han Cheol's subordinate]

  Support Role
• 
  Yun Chae Bin

  Yeon Sim [Dal I's roommate]

  Support Role
• 
  Park Bo Kyung

  [Dal I's mother]

  Support Role
• 
  Im Ki Hong

  [Dal I's father]

  Support Role
• 
  Ji Il Joo

  Do Seung Ji [Chief royal secretary]

  Support Role
• 
  Choi Hee Jin

  Jo Myeong Kim [Chief court lady]

  Support Role
• 
  Lee Dong Hee

  [Royal tailor]

  Support Role
• 
  Lee Kyo Yeob

  [Yi Un's steward]

  Support Role

Guest Role

• 
  Yang Jin Seon

  [Ji Pyeong 's wife] (Ep. 1-2)

  Guest Role
• 
  Kim Ro Sa

  [Court lady] (Ep. 1)

  Guest Role
• 
  Kim Do Geon

  [Sam Sin's messenger] (Ep. 1)

  Guest Role
• 
  Seo Byung Chul

  [Peddler] (Ep. 1)

  Guest Role
• 
  Seo Jang Hyun

  [Rich teen bully] (Ep. 1)

  Guest Role
• 
  Lee Ju Young

  [Rich teen bully] (Ep. 1)

  Guest Role
• 
  Woo Min Gyu

  Mak Soe (Ep. 1-2)

  Guest Role
• 
  Lee Jae In

  [Official] (Ep. 2-3)

  Guest Role
• 
  Jang Nam Yul

  Kim Ji Pyeong (Ep. 2)

  Guest Role
• 
  Lee Joong Yul

  [Physician] (Ep. 2)

  Guest Role
• 
  Kim Jae Man

  [Physician] (Ep. 2)

  Guest Role
• 
  Shin Jun Chul

  [Physician] (Ep. 2)

  Guest Role
• 
  Jeong Seo Yul

  [Physician's helper] (Ep. 2)

  Guest Role
• 
  Lee Moo Nyoung

  [Resident] (Ep. 2)

  Guest Role
• 
  Jang Moon Seok

  [Resident] (Ep. 2)

  Guest Role
• 
  Gu Hyun

  Yi Un [Child] (Ep. 3)

  Guest Role
• 
  Kang Hye Rin

  Kim U Hui [Child] (Ep. 3)

  Guest Role
• 
  Oh Jin Seok

  [U Hui's servant] (Ep. 3)

  Guest Role
• 
  Lee Dong Gi

  [Military officer] (Ep. 3)

  Guest Role
• 
  Park Hyo Jun

  [Bandit leader] (Ep. 4)

  Guest Role
• 
  Kim Hwi Gyu

  [Bandit] (Ep. 4)

  Guest Role
• 
  Bae Hyun Kyung

  [Scholar] (Ep. 5)

  Guest Role
• 
  Yoon Hyun Sik

  [Eunuch] (Ep. 5)

  Guest Role
• 
  Kang Cho Won

  [Court lady] (Ep. 5)

  Guest Role
• 
  Chae Yeon Hee

  [Court lady] (Ep. 5-6)

  Guest Role
• 
  Han Ji Won

  [Assistant physician] (Ep. 5-6)

  Guest Role
• 
  Kim Ye Won

  Jo Mi Geum (Ep. 6)

  Guest Role
• 
  Lee Sung Il

  [Finance minister] (Ep. 6)

  Guest Role
• 
  Park Chan Kuk

  [Chief scholar] (Ep. 6)

  Guest Role
• 
  Jang I Jun

  [Scholar] (Ep. 6)

  Guest Role
• 
  Kim Min Che

  [Shop owner] (Ep. 6)

  Guest Role
• 
  Yoon Jung Wook

  [Sketch artist] (Ep. 6)

  Guest Role
• 
  Lee Jae Soon

  [Incense seller] (Ep. 6)

  Guest Role
• 
  Gi Yeon Ho

  [Incense seller's husband] (Ep. 6)

  Guest Role
• 
  Kang Chae Min

  [Jimjo merchant's son] (Ep. 6)

  Guest Role
• 
  Lee Young Suk

  [Old man under moon]

  Guest Role
• 
  Hong Ru Hyeon

  [Queen dowager's court lady]

  Guest Role

Unknown

• 
  Jang Hee Jin Unknown