• 
  Woo-bin Kim
• 
  Shin-Hye Park
• 
  Min-ho Lee
• 
  Aaron Groben
• 
  Mi-Kyung Kim
• 
  Ha-Neul Kim

   Lee Hyo-Shin (11 episodes, 2013)
• 
  Mi-kyung Kim

   Park Hui Nam (20 episodes, 2013)
• 
  Son Ha Yoon

   Esther Lee (11 episodes, 2013)

• 
  Seong-ryeong Kim

   Han Ki-ae (20 episodes, 2013)
• 
  Choi Jin-Hyuk

   Kim Won (20 episodes, 2013)
• 
  Krystal Jung

   Lee Bo Na (20 episodes, 2013)
• 
  Joon-geum Park

   Jung Ji Sook (10 episodes, 2013)
• 
  Won-young Choi

   Yoon Jae Ho (20 episodes, 2013)
• 
  Ji-won Kim

   Rachel Yoo (20 episodes, 2013)
• 
  Min Hyuk Kang

   Yoon Chan Young (20 episodes, 2013)

• 
  Hyung-Shik Park

   Jo Myung Soo (11 episodes, 2013)
• 
  Dong-hwan Jung

  Kim Nam Yoon
• 
  Jin-ho Choi

  Choi Dong Wook
• 
  Ju-Eun Lim

  Jeon Hyun Joo
• 
  Soo Jin Jun

  Kang Ye Seol