Shim Gun Wook is a mysterious, seductive, fatally charming man who is highly ambitious in achieving his goal. After his parents' death, he believes that President Hong of Haeshin Group is the caused of all this misery. Thus, he takes a step to get closer to his enemy by preying charmingly into the youngest daughter of Hong family, Hong Mo Ne who has fallen madly and hopelessly in love with Gun Wook's charm and good-looks. Moon Jae In is a strong, independent woman, who has been living for herself and her younger sister, Won In. After getting dumped by her boyfriend, she is determined to snag Hong Tae Seong, the family's most rebellious son with a hidden past. He was born out of wedlock, and took by the rich family after they found out that his DNA matches. His life will become complicated once Shim Gun Wook steps in to cause all the turmoil. Tae Seong's oldest sister, Hong Tae Ra was born as the first daughter of the Hong family. All her life, she has always been the obedient oldest daughter. She has never said no to her parents and went through an arranged marriage to a prosecutor. Tae Ra lives her life like the typical upper-class housewife, raising her only daughter, So Dam. But soon after she meets Gun Wook upon a coincidence meet, she throws herself into a heated love affair with the man who can both have the face of an angel and a devil at the same time.