Seo In-guk as Pindol / Kang Sae-dol / Drill-bit

Lee Soo-hyuk as Hwang Geon-woo

Um Mun-suk as Jung Woo-sung / New Bird / Welder

Yoo Seung-mok as Chief Na Choon-shik

Tae Hang-ho as Park Gap-sung / Big Shovel

Bae Yu-ram as Cho Man-sik

Bae Da-bin as Song Eun-joo / Counter

Seo Dong-won as General Dung

Ji Dae-han as Straw

Shin Yoo-ram as White Bear

Shim So-young as Bong-soo's Mother

Cho Young-gil as Detective

Jeong Hyeong-Ho as Intelligence Team Leader

Woo Kang-min as Patrol Team Leader