Yoon Ji ah (22 year old beautiful lady)got betrayed by her best friend and her boyfriend.she ended up having a one night stand with a rich billionaire (Lee Do hyun) who was cold and merciless.He refuses to let that one night pass as a mistake,he asks her to sign a marriage contract in exchange for his first night she took from him.Yoon ji ah found out she wasn't the daughter of a poor father she thought she was but was however the Heiress of the biggest shareholder group in china connecting her to the CEO she had a one night stand with.many mysteries began to unravel and Yoon Ji ah found out that not only was she a future Heiress but her life was also at stakeLee Do hyun proposed marriage to her as a medium to protect her claiming he was the one who can shield her properly from the whores who were after her father's property but she rejected his proposal every time due to the fact that they hate and loathe each other severely.However hatred couldn't win over love, Lee do hyun fell first and she fell harder.They spent time together and shared good memories until a deep secret was unravelled connecting Lee Do hyun to her past and his parents having a hands in her father's death and her mother's disappearance.Was her mother still alive?who was the one pulling strings from the shadow ? would their love conquer family grudges,walls built between betrayal and deception and darkness that threatens to tear them apart?