A drama about a no-filter, crazy man with guts, taking revenge on the Korean National Tax Office.

Hwang Dong Joo is the chief of taxation division 5 at the National Tax Service. He works hard to trace money that is hidden from the tax service. His team includes Seo Hey Young, who has a bright personality and his boss is Oh Young. Meanwhile, In Tae Joon is the director of a regional tax office. He is an ambitious man.