Plot: Jang Ho-Woo (Kim Myung-Soo) 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 (Choi Jin-Hyuk) also works at Taeil Accounting Firm. He has a perfect background and his father works as a vice president at Taeil Accounting Firm.