Secret Royal Inspector

Director

• 
  Kim Jung Min

Screenwriter

• 
  Park Sung Hoon

Main Role

• 
  L

  Seong I Gyeom

  Main Role
• 
  Kwon Na Ra

  Hong Da In

  Main Role
• 
  Lee Yi Kyung

  Park Chun Sam

  Main Role

Support Role

• 
  Lee Tae Hwan

  Seong I Beom

  Support Role
• 
  Jo Soo Min

  Kang Sun Ae

  Support Role
• 
  Ahn Nae Sang

  Jang Tae Seung [Chief royal secretary]

  Support Role
• 
  Son Byung Ho

  Kim Byeong Geun [Chief state councilor]

  Support Role
• 
  Hwang Dong Joo

  [King]

  Support Role
• 
  Shin Ji Hoon

  Choi Do Gwan [Royal guard]

  Support Role
• 
  Chae Dong Hyun

  Kim Man Hui [Royal court]

  Support Role
• 
  Park Joo Hyung

  Seo Yong

  Support Role
• 
  Yeom Dong Hun

  Cho Pil Ha [Royal court]

  Support Role
• 
  Han Jae Seok

  Kang Jong Gil

  Support Role
• 
  Choi Jong Won

  Kang In Cheong

  Support Role
• 
  Kim Joo Young

  Sa Wol

  Support Role
• 
  Jong Ho

  Man Deok [Bandit]

  Support Role
• 
  Kang Yoon

  Kim Dae Gwang

  Support Role
• 
  Jo Deok Hee

  Jung Mun Ho [Scholar]

  Support Role
• 
  Kim Myung Soo

  Kim Myeong Se [Jeonju governor]

  Support Role
• 
  Jeon Sung Hwan

  Kang In Cheong

  Support Role
• 
  Kim Yeong Cheol Support Role
• 
  Kim Kyung Sook Support Role
• 
  Um Hyo Sup Support Role
• 
  Lee Min Woo Support Role
• 
  Han Eun Seong

  Kang Jong Gil

  Support Role
• 
  Ahn Se Ha

  Eunuch Kim

  Support Role
• 
  Song Kyung Hwa

  Court Lady Kim

  Support Role
• 
  Seo Byung Chul

  [Choi Byeong Seol's subordinate]

  Support Role

Guest Role

• 
  Shin Hee Gook

  [Eunuch] (Ep. 1)

  Guest Role
• 
  Min Jung Sup

  [Courtesan house client] (Ep. 1)

  Guest Role
• 
  Choi Gyo Shik

  [Hired finder] (Ep. 1)

  Guest Role
• 
  Song Young Ah

  [Courtesan] (Ep. 1)

  Guest Role
• 
  Jo Ji Hyun

  [Restaurant owner] (Ep. 1)

  Guest Role
• 
  Kang Hyun Jung

  [Head courtesan] (Ep. 1-2)

  Guest Role
• 
  Kim Seung Soo

  Park Cheol Gyu (Ep. 1, 3)

  Guest Role
• 
  Kim Seo Jung

  [Head courtesan] (Ep. 2)

  Guest Role
• 
  Jun Sung Won

  [Local resident] (Ep. 2)

  Guest Role
• 
  Kim Hyun Chang

  [Local resident] (Ep. 2)

  Guest Role
• 
  Jung Wan Hee

  [Soldier] (Ep. 2)

  Guest Role
• 
  Kim Kye Hyung

  [Soldier] (Ep. 2)

  Guest Role
• 
  Lee Seung Won

  [Tax collector] (Ep. 2-3)

  Guest Role
• 
  Jeon Young

  [Inn proprietor] (Ep. 2-3)

  Guest Role
• 
  Yoon Jong Goo

  [Bow & arrow maker] (Ep. 2-3)

  Guest Role
• 
  Shin Ji Woo

  [Courtesan] (Ep. 2-3)

  Guest Role
• 
  Kim Ji Hwan

  [Widower's elder son] (Ep. 2, 4)

  Guest Role
• 
  Kim Ye Sung

  [Widower's son] (Ep. 2, 4)

  Guest Role
• 
  Park Da An

  [Tax levied widower] (Ep. 2-5)

  Guest Role
• 
  Yoo Yong

  [Public official] (Ep. 3)

  Guest Role
• 
  Ri Min

  [Doctor] (Ep. 3)

  Guest Role
• 
  Park Shin Woon

  [Prison guard] (Ep. 3-4)

  Guest Role
• 
  Jin Shi Won

  [Kang Jong Gil's soldier] (Ep. 4)

  Guest Role
• 
  Jung Ki Sun

  [Mountain passerby] (Ep. 4)

  Guest Role
• 
  Shin Shin Beom

  [Elderly prisoner] (Ep. 4)

  Guest Role
• 
  Park Joon Mok

  Dong Su (Ep. 4-5)

  Guest Role
• 
  Lee Kwan Hoon

  [Hwaeom Mountain captain] (Ep. 4-5)

  Guest Role
• 
  Kim Min Joong

  [Hwaeom prison sentry] (Ep. 4-5)

  Guest Role
• 
  Jang Joo Yeon

  [Newborn's mother] (Ep. 5)

  Guest Role
• 
  Ha Young

  Kim Mi Ok (Ep. 5-6)

  Guest Role
• 
  Yang Hyun Min

  [Magistrate] (Ep. 6)

  Guest Role
• 
  Shin Jun Chul

  [Gambler] (Ep. 6)

  Guest Role
• 
  Kim Wang Do

  [Diner] (Ep. 6)

  Guest Role
• 
  Yoo Jang Young

  Song Joo Nam (Ep. 6-7)

  Guest Role
• 
  Lee Ji Hae

  Mae Hyang (Ep. 6-7)

  Guest Role
• 
  Park Gwang Jae

  [Gambling house guard] (Ep. 6-7)

  Guest Role
• 
  Suh Sang Won

  [Bandit] (Ep. 6-7)

  Guest Role
• 
  Kim Jin Ok

  [Restaurant owner] (Ep. 6, 8)

  Guest Role
• 
  Song Yo Sep

  Lee Cheol Yong [Lord] (Ep. 7)

  Guest Role
• 
  Kwon Ban Suk

  [Coin chest courier] (Ep. 7)

  Guest Role
• 
  Jeon Min Hyup

  [Onlooker] (Ep. 7)

  Guest Role
• 
  Jang Ha Eun

  Lee Ae Ran (Ep. 7-8)

  Guest Role
• 
  Hwang Ji Yeon

  Gwi Seon (Ep. 8)

  Guest Role
• 
  Han Dong Gyu

  Choi Byeong Seo (Ep. 8)

  Guest Role
• 
  Park Si Hyun

  [Ae Ran's mother] (Ep. 8)

  Guest Role
• 
  Oh Jin Seok

  [Diner] (Ep. 8)

  Guest Role
• 
  Kim Yun Bae

  [Pervert] (Ep. 8)

  Guest Role
• 
  Hong Ru Hyeon

  [Grateful villager] (Ep. 8)

  Guest Role
• 
  Ko Gyeong Man

  [Medical examiner] (Ep. 8)

  Guest Role
• 
  Yong Jin

  [Herbal medicine seller] (Ep. 8)

  Guest Role
• 
  Lim Jung Min

  [Captain of royal guards] (Ep. 8)

  Guest Role
• 
  Jun Joon Woo

  [Police officer] (Ep. 9)

  Guest Role
• 
  Kim Jin Sub

  [Police officer] (Ep. 9)

  Guest Role
• 
  Han Myung Chul

  [Mask maker] (Ep. 9)

  Guest Role
• 
  Park Choong Hwan

  [Masked party guy] (Ep. 9)

  Guest Role
• 
  Go Yoo An

  [Masked party guy] (Ep. 9)

  Guest Role
• 
  Goo Hyeon Gyeong

  [Courtesan] (Ep. 9)

  Guest Role
• 
  Jung Dong Gyu

  Lord Kim (Ep. 9-10)

  Guest Role
• 
  Yoon Gi Won

  Bae Mu Ryong (Ep. 10)

  Guest Role
• 
  Jung Jong Woo

  [Jeonju captain] (Ep. 10)

  Guest Role
• 
  Noh Seung Woo

  [Prison guard] (Ep. 10)

  Guest Role
• 
  Richard Kim

  [Physician] (Ep. 10)

  Guest Role
• 
  Han Ji Hyo

  (Ep. 10)

  Guest Role
• 
  Park Ji Won

  [Village mother] (Ep. 10, 14)

  Guest Role
• 
  Chu Eun Kyung

  [Restaurant owner] (Ep. 10, 14)

  Guest Role
• 
  Lee Moo Nyoung

  [Headsman] (Ep. 11)

  Guest Role
• 
  Han Sang Kyung

  [Soldier] (Ep. 11)

  Guest Role
• 
  Park Jin Young

  [Village mother] (Ep. 11)

  Guest Role
• 
  Park Dong Bin

  Jeon Gye Su [Blacksmith] (Ep. 11-12)

  Guest Role
• 
  Kim Jae Il

  Geon Ju [Blacksmith] (Ep. 11-12)

  Guest Role
• 
  Park Young Soo

  Merchant Kwon [Rice buyer] (Ep. 11-12)

  Guest Role
• 
  Uhm Hye Soo

  [Woman listening to Park Chun Sam] (Ep. 13)

  Guest Role
• 
  Min Tae Hong

  [I Gyeom's servant] (Ep. 13)

  Guest Role
• 
  Lee Seung Chul

  [Street vendor] (Ep. 13-14)

  Guest Role
• 
  Cha Da Young

  [Court lady] (Ep. 13-14)

  Guest Role
• 
  Park Seon Hu

  [Mute man's son] (Ep. 13-14)

  Guest Role
• 
  Kim Deok Ju

  [Village leader's mother] (Ep. 14)

  Guest Role
• 
  Kim Tae Bum

  [Diner] (Ep. 14)

  Guest Role
• 
  Hong Dae Sung

  [Patrolman] (Ep. 14)

  Guest Role
• 
  Kim Do Young

  [Doctor] (Ep. 14-15)

  Guest Role
• 
  Im Seo Eun

  [Mountain homeowner] (Ep. 14-15)

  Guest Role
• 
  Kang Hak Soo

  Merchant Jang (Ep. 15)

  Guest Role
• 
  Lee Geun Hoo

  [Slave market manager] (Ep. 15-16)

  Guest Role
• 
  Park Do Joon

  [Slave market guard] (Ep. 16)

  Guest Role
• 
  Jang Won Young

  Byeon Hak Su [Governor]

  Guest Role
• 
  Seo Sang Won

  Gap Sik [Bandit]

  Guest Role
• 
  Choi Young Woo

  Park U Min

  Guest Role
• 
  Sunwoo Jae Duk

  Prince Hwi Yeong

  Guest Role
• 
  Lee Kun Goo

  [Seo Yong's subordinate]

  Guest Role
• 
  Lee Dong Young

  [Village leader]

  Guest Role
• 
  Jung Yun Cheol

  [Military soldier]

  Guest Role
• 
  Jeon Jeong Il

  [Propaganda officer]

  Guest Role
• 
  Lee Young

  [Bandit]

  Guest Role
• 
  Suh Ji Ho

  [Beggar]

  Guest Role
• 
  Jo In Pyo

  [Magistrate's subordinate]

  Guest Role
• 
  Lee Sang Woon Guest Role

Unknown

• 
  Han Yoo Eun Unknown