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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 Hye 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 who has earned his way to the top through corrupt and illegal actions, all the while maintaining his cocky attitude.
(Source: AsianWiki, Soompi)