Woo Hyun

Kwon Chil-bong

No-ong

Cha Kang-cheon

Ha Yeong-soo

Eunuch Neung

Village chief

Lim Goo-sik

Park Pil-doo: an elder in the world of ssireum who runs a local sarangbang.

Kim Gil-joong, chief of the neuroscience team at the Seobu Police Station who has a "menopausal brain"

Noh Myung-nam

Choi Dal-seung

A security guard at the apartment where Sang-eun lives.

Monk Ho-yeon

President Park / Park Seong-deok

Yang Young-soon, a non-tax payer of one billion won in clone funds.

Judiciary

Sung Dong-il

Bae Seung-gwan, 60 years old, Joongsan Police Chief

Hong Yi-jang: The head of the village and the youth president.

Kim Suk-hyun, a convenience store owner notorious for his short temper and abusive treatment of his wife.

The Jangseung of Yeou Gogae who appears as a mysterious old one-eyed drunkard. He first appeared at a bus stop where Nam Ji-ah was supposed to board a bus that went into a fatal accident later. He annoyingly grabbed Ji-ah's leg to stop her from boarding which also meant saving her life. She volunteered to carry him on her back going home but asked to be dropped off by the side of the road. Later on, he involuntarily gave Rang the lead to obtaining the Eyebrows of the Tiger (Ep. 1 & 5).

Kwon Eui-choo

Mr. Han (ep. 2)

Myung Gye-chul

Kim Chi-ah (Ep. 1)

Man in sauna (ep. 16)

Boongeo

Doctor (Ep. 1)

Baek Geum-sul, Ha-in's patient, impersonating doctor.

Han Sang-wok

Choi Hyo-dong

Noh Jong-il

Staff at National Institute of Scientific Investigation

Do Jung-man

Choi Go-soo

Suk-tae's father

In-sung's father

Wang Yong-chun, a man with spider tattoo.

Go Man-seok, 48-year-old rest stop owner

Won-sang's friend

Han Sang-wook aka Milyang

Gong Hyuk

Woo Hyeon – Park Soon-taek's senior (ep. 15–18)

Adult Sung No-eul

Byun Woo-sik

Alcohol-dependent, mental patient (Ep. 1)

Dal-po's homeroom teacher

Chul-min, a former convict and one of Chae Chi-soo's clients who now works at the café.

Dal-hyang's father

Hama

Kim Woo-hyun

Lee Bang-ji

A golf equipment maker and friend of John Lee

Kim Mal-jung (김말중), interpreter

Wheat seller