Jeong Jae-seong

as Na Byeong-mo (12 episodes)

as Choi Chang-soo (2 episodes)

as Lee Bong-seok (9 episodes)

as vice-principal (Yu-seong Tech) (10 episodes)

as Baek Cheol-gyu (16 episodes)

as Han Kyung-rok (16 episodes)

as Kim

as Seon-ho's father (1 episode)

as Yuk Si-gyeong (16 episodes)

as Pyo Dong-ho

as Park Yoongab (16 episodes)

as Marshal Kim (12 episodes)

as Kim Byeong-chan

as No Hak-Su (20 episodes)

as Kim Min-sub

as Deok Chul's father (2 episodes)

as Kong Ji-cheol (16 episodes)

as Chief neurosurgeon (12 episodes)

as Kim In-Joo (16 episodes)

as Kang Mong-koo (16 episodes)

as Kwon Suk (16 episodes)

as Bae Sang-bok (16 episodes)

as [Oh Sol’s boss] (1 episode)

as Representative Goo