Shin Cha Il begins work as the leader of the audit team at JU Construction, where corruption runs rampant. Shin Cha Il doesn't have faith in other people. He has a cool demeanor and carries out his work with sharp judgment and decisive action. The audit team also includes rookie employee Gu Han Soo. He initially applied for the audit team as a stepping stone to get transferred to his company's Florida branch, but his plan was not easy because of Shin Cha Il. Unlike his boss, Gu Han Soo is a nice and warm-hearted person. Working with Shin Cha Il, Gu Han Soo grows as an audit team member.

• Shin Ha-kyun
• Lee Jung-ha
• Jin Goo
• Jo A-ram
• Jung Moon-sung
• Lee Do-yeop
• Kim Hong-pa
• Baek Hyun-jin