Ho Woo is the first high school graduate to immediately become an accountant at the nation’s top accounting firm. He has outstanding memory, observation, adaptation, and justice that distinguish him from other accountants. Yeon A is his senior colleague who mentors him in his work and helps him reveal the secrets behind the numbers. Je Kyun is the vice president of the firm who has a reputation for being generous, but he will not hesitate to get what he wants. Can Ho Woo uphold justice in this corrupt firm?