Choi Young-joon

Lieutenant Colonel Kato (Japanese: 陸軍中将賀東, Hepburn: Rikugun-Chūjō Gatō)

Musa

Ryu Jae-hyeok: a prosecutor and Moo-young's senior.

Yoon Se-pil

Detective Kim

Bang Ho-sik, an ice maker who sells ice at a fish market in Jeju Island and Bang Young-joo's father. Kang Yi-seok as young Bang Ho-sik

Cho Young-woon

Jang Seong-woo, a high school theater teacher.

Baek Dong-hun, a detective

Bong Gwang-hyun, assistant professor of emergency medicine.

Choi Jae-sub, veteran detective