Choi Mu-sung

as Yi-yeon's father (3 episodes)

as Self (3 episodes)

as Gadget

as Director Han

as Kim Dae-uk (16 episodes)

as Jeong Yi-hwa (10 episodes)

as Lee Yong-sik

as Kim Tae-baek (12 episodes)

as Hwang Man-dae (6 episodes)

as Yang-cheon (21 episodes)

as Song Woo-byeok (14 episodes)

as Choo Young Woo (16 episodes)

as B

as Kim Jae-joon

as Lee Hyeong-ik

as Hwang Yong-soo (10 episodes)

as Song Doo Cheol [Bukyeongpa gang] (16 episodes)

as Delivery Man

as Yong-kang

as Mak-Chi (2 episodes)

as Self (1 episode)

as Phoenix Shop Owner (1 episode)

as Commander

as Hwang Bo-yoon

as Jeon Bong-Joon (48 episodes)