Decibel

Cinematography

• 
  Park Jong Chul

Costume Designer

• 
  Hong Soo Hee

Editor

• 
  Kim Chang Ju

Martial Arts Choreographer

• 
  Park Yeong Shik

Screenwriter

• 
  Lee Jin Hoon

Screenwriter & Director

• 
  Hwang In Ho

Main Role

• 
  Kim Rae Won

  Kang Do Yeong

  Main Role
• 
  Lee Jong Suk

  Jeon Tae Seong

  Main Role
• 
  Jung Sang Hoon

  O Dae O

  Main Role
• 
  Park Byung Eun

  Cha Yeong Han

  Main Role

Support Role

• 
  Lee Sang Hee

  Jang Yu Jeong [Naval E.O.D superior]

  Support Role
• 
  Jo Dal Hwan

  No Jeong Seop

  Support Role
• 
  Lee Jong Wook

  Lee Jun Wi [Warrant officer]]

  Support Role

Guest Role

• 
  Cha Eun Woo

  Jeon Tae Ryeong [Naval Submarine acoustic detection officer]

  Guest Role
• 
  Kim Seul Ki

  Han Mi Nyeo

  Guest Role
• 
  Lee Min Ki

  Hwang Yeong U [Navy captain]

  Guest Role
• 
  Kang Kyung Hun

  [Superintendent]

  Guest Role
• 
  Hong Ju Won

  [Navy soldier]

  Guest Role

Bit part

• 
  Nam Tae Hoon

  Su Yeong [Reporter #2]

  Bit part
• 
  Han Min Yeop

  Kim Seong Jin [Second lieutenant]

  Bit part
• 
  Han Sang Kyung

  Yeong Man [Safety guard ]

  Bit part
• 
  Shin Yun Ju

  Kang Seol Yeong

  Bit part
• 
  Park Jin Soo

  Kim Dong Hun [Minister of National Defense]

  Bit part
• 
  Kim Jung Woo

  Team Leader Lee

  Bit part
• 
  Na Hyun Woo

  Seong U

  Bit part
• 
  Park Sung Hoon

  Executive Lee

  Bit part
• 
  Woo Ji Hyun

  Kim Yu Taek

  Bit part
• 
  Lee Seung Hoon

  Lieutenant Kim

  Bit part
• 
  Jo Yeon Woo

  Dae U

  Bit part
• 
  Kwon Dong Ho

  Lieutenant Cha

  Bit part
• 
  Choi Mi Ra

  [Captain Hwang's wife]

  Bit part
• 
  Cha Jung Hwan

  [Minister of National Defense's secretary]

  Bit part
• 
  Kim Gun

  [Former investigator / Security agent's voice]

  Bit part
• 
  Yoon Jung Yul

  [Team leader]

  Bit part
• 
  Noh Sung Eun

  [Submarine cook]

  Bit part
• 
  Jung Woo Hyuk

  [Chief of Naval Staff]

  Bit part
• 
  Jang Se Won

  [Engine crew #1]

  Bit part
• 
  Ahn Tae Hwan

  [Engine crew #2]

  Bit part
• 
  Ryu Si An

  [Engine crew #3]

  Bit part
• 
  Seo Woo Jin

  [Crew member #2]

  Bit part
• 
  Lee Han Ju

  [Crew member #3]

  Bit part
• 
  Han Gi Chan

  [Crew member #6]

  Bit part
• 
  Shin Young Chan

  [Crew member #9]

  Bit part
• 
  Kim Dong Hoon

  [Crew member #11]

  Bit part
• 
  Kim Dong Yeon

  [Crew member #12]

  Bit part
• 
  Ryu Philip

  [Crew member #13]

  Bit part
• 
  Jang Yong Hee

  [Crew member #15]

  Bit part
• 
  Lee Young Hoon

  [Crew member #16]

  Bit part
• 
  Han Chang Hyun

  [Agency for Defense Development director]

  Bit part
• 
  Yoon Hyun Gil

  [President of the Football Association's wife]

  Bit part
• 
  Lee Jung Joon

  [Cadet #1]

  Bit part
• 
  Ahn Da Jung

  [Nurse]

  Bit part
• 
  Yun Ki Chang

  [Man opening the window]

  Bit part
• 
  Choi Yoon Bin

  [EOD agent #1]

  Bit part
• 
  Cho Han Gyeol

  [Alert team member #1]

  Bit part
• 
  Shin Chi Young

  [Detective #2]

  Bit part
• 
  Kam Seung Min

  [Consulting doctor]

  Bit part
• 
  Lee Hyun Ah

  [TV broadcast reporter]

  Bit part
• 
  Lee Hwa Young

  [Crewmember 5]

  Bit part

Voice Actor

• 
  Jo In Woo

  Jeon Tae Seong #1

  Voice Actor
• 
  Kim Ye Jin

  [Announcer 1]

  Voice Actor
• 
  Kim Se Yong

  [Announcer 2]

  Voice Actor
• 
  Bae Sung Jae

  [Soccer announcer]

  Voice Actor