Joo In-A (Shin Hae-Sun) works as the head of an audit department at Haemu Group. She is a perfectionist, who never allows compromise when it comes to work. If somebody gets marked by her, that person gets ruthlessly crushed by her. She is professional enough to earn the title of the youngest female executive at Haemu Group. She gets entangled with Noh Ki-Jun (Gong Myung), who she has appointed to deal with internal scandals, and encounters chaos at work. Noh Ki-Jun is smart and good looking. His life goes by smoothly, but Joo In-A's appearance suddenly puts a brake on his smooth life. He is demoted from the elite audit team 1 to the problematic audit team 3. His job is to deal with internal scandals.

Meanwhile, Jeon Jae-Yeol (Kim Jae-Wook) is a third generations heir from a chaebol family that runs Haemu Group. He seems like a perfect guy, but he hides a void behind his elegant appearance. He opts for reality over love to win a precarious race for succession in the Haemu Group. Park A-Jeong (Hong Hwa-Yeon) works as Jeon Jae-Yeol's secretary. She realized that her beautiful appearance can make her life more difficult, so she has kept her guard up. Yet, she begins to have a severe crush for the first time in her life.