Ma Dong-seok as Baek Sung-il/Park Woong-cheol – manager of Tax Collection Bureau's section 3^[9]
Seo In-guk as Yang Jeong-do – professional swindler
Choi Soo-young as Cheon Sung-hee – Tax Collection Bureau's officer

Song Ok-sook as Noh Bang-shil – nickname "Wallet"
Heo Jae-ho [ko] as Jang Hak-joo – nickname "Cannon"
Ko Kyu-pil as Jung Ja-wang – nickname "Keyboard"
Lee Sun-bin as Jo Mi-joo – nickname "Kkotbaem"^[10]^[11] = flower-snake (literally) = seductive girl (meaning)
Kim Joo-ri as Choi Ji-yeon

Ahn Nae-sang as Cheon Gap-soo – mayor of Seowon
Jo Woo-jin as Ahn Tae-wook – director of Tax Collection Bureau
Kim Byung-choon [ko] as Kang Noh-seung – manager of Tax Collection Bureau's section 1
Lee Hak-joo [ko] as Ahn Chang-ho – young employee of Tax Collection Bureau
Kim Joo-hun as Investigator Park – investigator of Tax Collection Bureau's section 3
Jung Do-won as Investigator Kim – investigator of Tax Collection Bureau's section 3

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