- Kim Young-kwang
- Woo Su-han
- Lee Sun-bin
- Yoo Da-hee
- Oh Dae-hwan
- Jeon-hoon
- Seo Hyun-chul
- Chief Detective
- Choi Byung-mo
- Team Leader Chao
- Kim Tae-hoon
- Sin Gi-roo
- Lee Sang-hong
- Commander of the Ax gang
- Lee Ji-hoon
- NIS team manager
- Park Ji-yeon
- Do Doo-ho's mom
- Park Jin-su
- Detective
- Roh Yeong-hak
- Hacker
- Na Kwang-hoon
- Chinese MSS director
- Shin Gi-hwan
- NIS agent
- Seo Beom-sik
- Ax gang boss
- Park Kwang-jae
- Big member of Ax gang
- Chung Chang-Hyun
- Slim member of Ax gang
- Han Kap-soo
- Detective agency building owner
- Choi Jong-nam
- President Park Doo-sik
- Paul Battle
- Ship Captain
- Go Da-yeon
- Sin Gi-roo's nurse
- Lee Joo-won
- Do Doo-ho
- Hwang Jung-min
- Dorothy
- Woo Kang-Min
- Korean mercenary leader
- Fila Lee
- Jeon-hoon's secretary
- Hong Seok-cheon
- Self
