• 
  Lee Jae-Gyu

  regizor

• 
  Ja-ram Hong

  scenarist
• 
  Jin-ah Hong

  scenarist

• 
  Ha Ji-Won

  Kim Hang Ah
• 
  Jung-suk Jo

  Eun Shi Kyung
• 
  Kwon Choi

  Kwon Young Bae
• 
  Man-shik Jeong

  Ri Kang Suk
• 
  Samantha Daniel

  Bon Bon

• 
  Seung-gi Lee

  Lee Jae Ha
• 
  Sung-min Lee

  Lee Jae Kang
• 
  Yeo-Jung Yoon

  Bang Yang Sun
• 
  Do-gyung Lee

  Kim Nam Il
• 
  Dong-Hyun Yum

  Park Ho Chul
• 
  Gook-hwan Jeon

  Hyun Myung Ho
• 
  Gun-Tae Park

  Jae Kang as a child

• 
  Han-Byul Kang

  Jae Ha as a child
• 
  Hyun-Sang Kwon

  Yeom Dong Ha
• 
  Yun-ji Lee

   Lee Jae Shin (15 episodes, 2012)
• 
  Jason-Patrick Taylor

   Colin (19 episodes, 2012)
• 
  Choe Min

  Korean Drill Sergeant
• 
  Troy Zitzelsberger

  American Soldier
• 
  Brad Curtin

  US Diplomat
• 
  Vickie Eisenstein

  Party Guest
• 
  Eric Sebastian Taylor

  Executives Son
• 
  Hyeon-sang Kwon

  Yeom Dong Ha
• 
  Soon-jae Lee

  Eun Kyu Tae
• 
  Yuh-Jung Youn

  Bang Yang Sun
• 
  Je-mun Yun

  John Mayer