Watchman at Seowon station
Filmmaker
Kim Dong-hwan
Mayor
Retainer 1
Senior Statesman 4
Yu
Manager
Detective Choi
Gyeong-bin
Boss Yoon
Head of the Detective Department (ep. 2)
Mr. Hwang
Village Head Chang Yu-Tang
Choi Moon-seon
General Myeongryun
Seungil
Kim Seok-deok (Youngsook's husband)
Kang Man-guk
Han Kim
Won Se-jong (Sang-hyeon's middle school classmate)