Go Geon-han

Myung-ha's senior (episodes 1, 4, 6, 8)

Prince Hwaing

Lee Kwang-hee

Jang Eung-soo

Kim Ho-seok

Cha Geum-sae

CEO's son

Jang San-beom

Kim Jordan: Hyeon's colleague who is an inspector at the Cyber Safety Bureau of SMPA.

Lee Ho-jun

Lee Seon-ho

Yoon Sang-gi

Alex

Attorney Meng

Yang Yong-cheol, a man who claimed to be the "Red Hat" murderer.

Event Moderator

Dong-woo

Kim Do-ryung

Jun-ho, Eun-ha's ex-boyfriend (Ep.9)

Byun Sa-chae, 29 years old, Ki-jin's best friend

Choi Yoon-jae, a resident who is viciously hunted by Sang-wook throughout the series.

Oh Dong-geun

Jo Ham-duk, Moo-gil's hometown friend.

Kim Sun-woo

Yeon Geun, a rich man who manages the widow village and is entangled with Nok-du.

Jeon Young-shik, Oh-dol's senior at the Taekwondo training center.

Kim Joon-tae

Park Shin-seon

Seo-won

Mr. Byeong

Kang Soo-ha's son