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Jang Ho Woo works as an accountant at Taeil Accounting Firm. That company is one of the 4 big accounting firms in South Korea. Jang Ho Woo happens to be the only employee at Taeil Accounting Firm with just a high school diploma, but he is very intelligent. He faces absurdities at the accounting firm and fights for justice. Meanwhile, Han Seung Jo also works at Taeil Accounting Firm. He has a perfect background, and his father works as a vice president at Taeil Accounting Firm.