• 
  In-seon Jeong

  4 episodes, 2018
• 
  Yi-Kyeong Lee

  4 episodes, 2018
• 
  Won-hee Ko

  4 episodes, 2018
• 
  Seung-Won Son

  4 episodes, 2018
• 
  Jung-Hyun Kim

  4 episodes, 2018
• 
  Sohee

  Kim Jung Eun
• 
  Ga-young Moon

  Han Soo Yeon
• 
  Kim Ye Won

  Cha Yoo Ri

• 
  Lee Joo-woo

  Min Soo Ah
• 
  Hyun-soo Shin

  Kook Ki Bong
• 
  Sun-ho Kim

  Cha Woo Shik
• 
  Soo-kyeong Jeon

  Waikiki house owner
• 
  In-gi Jeong

  Soo Yeon's father
• 
  Ji-Sang Han

  Tae Hyun sunbae
• 
  Dong-jin Jeong

  Min Seok

• 
  Hyeong-tak Shin

  Ki Bong's senior
• 
  Deok-hwa Lee

  Actor Lee Deok Hwa
• 
  Jo Woo-Ri

  Sun Woo
• 
  Yull Jang

  (2018)
• 
  Yeong-ok Kim

  Jang Gun's grandma
• 
  Go Min-Si

  Lee Min Ah