Jang Geu-Rae (later played by Siwan) played the board game go since he was a child. Playing the game was everything to him, but he failed to become a professional go player. Now he is thrown into the real world. By an acquaintance’s recommendation, Jang Geu-Rae is able to begin to work for the trading company One International as an intern.
On his first day, Jang Geu-Rae meets his boss Oh Sang-Sik (Lee Sung-Min). Jang Geu-Rae struggles to work at his new company.