Kim Kwang-kyu (actor)

Na Dae-sub: A-jeong's father.

Ji Min-ji

Kim Myung-bo, SS Bank branch manager Jeju Pureung, classmate with Han-soo.

Shin Joong-hae

Kang Seon-ho's homeroom teacher. (Ep.1)

Kim Joong-hyuk

Choi Won-ho

Hong Pyeon, editor-in-chief (Ep. 2-5, 16)

Gang boss (ep. 1)

Nam Byung-kwan

Hong Jong-hak

Director at Gal-hee's interview (ep. 3)

Squad Chief Jang

Representative Bang Kwang-gyu

Song Yoo-taek

Kong Jang-Soo

Kim So-wool

Choo Won-gong

Pi Joo-ki

(Ep. 1-2)

Park Ho-joon

As Mr Gong (ep. 1)

Yi Yeong-bu

Kim Gong-joo

Director Oh

Jung Byung-dal, Byung-hoo's younger brother

Manager Han

Han-kyul's homeroom teacher

"Manager Shin"

Judge Kim Gong-sook

Gas station customer

Park Myung-gi

A high school teacher (ep 4)

Lee Bang (ko)

Manager

Botanical garden director and Young-kyu's boss.

Yoon Bong-kil, Yeon-jae's office mate/tango instructor Ramses

Han Min-kwan

Kang-jin's homeroom teacher

Plastic surgeon

Team leader Go at the post office

Bae Seong-bin

Chief Kwak

Male harassing passenger on airplane

Department head Gong

Inspector Jang (cameo)

Detective

(cameo, ep. 2)

Man at bus stop (ep 13)