Jo Han-chul

Jo Sang-heon

Chief Joo

Bae Geun-sik, Seok-ryu's father who runs a small snack restaurant in the neighborhood.

Woo Do

Ko Jae-geun

Yoon Jung-won

Jang Tae-in

The King

Oh Jin-won, Beom-seok's adoptive father. A wealthy but cruel and prideful assemblyman.

Kim Gye-jang

Jin Dong-ki

Lee Pyun-woong

Yoon Ah-yi's father

Lee Tae-sang

Store manager (Ep. 1-2)

Han Seung-hyuk

Park Il-hae, the ranger team leader.

Oh Cheon-jae, the owner of Gongjin's live café and pub. He is a former singer with stage name Oh Yoon, who disappeared after releasing a hit song in the 1990s.

Jo Won-chul — Loan shark that harasses Yeon-hong for her debts.

Yoon Hee-seob

Jin Jae-gyu Choi Seung-yoon as young Jin Jae-gyu Seo Eun-yool as child Jin Jae-gyu

Won Yu (season 2), descendant of an exiled member of the royal family living a quiet life on remote island, who is sought out by Lee Chang.

Bong Ji-hong. He is married to Seo Young-ah.

Go Hyun-woo

Yoon Dong-chan

Chang-geun, a police detective.

The King

Doo-sik

Kim Tae-jung

Kim Do-shin

Park Tae-kyu

Secretary Kim

Choi Hyung-kil

Yoon Dong-won, a detective specializing in cyber crimes, formerly Jo Min-ja's hoobae.

Kim Chang-soo, team leader of Retail Team

Shin Kang-ho