Fifteen year old Lee Soo-yeon (Kim So-hyun) is a victim of bullying at school, targeted because her father was a murderer. Through a series of fated events, she meets Han Jung-woo (Yeo Jin-goo), the son of a chaebol and gangster. Jung-woo protects Soo-yeon from the bullies, they become friends and soon fall in love. One day, Jung-woo was kidnapped and Soo-yeon, who witnessed the abduction, attempts to help – only to be taken by the kidnappers as well.
Kang Hyung-joon (Ahn Do-gyu)’s mother, the mistress of Jung-woo’s grandfather, and Jung-woo’s father have been fighting over a large sum of money. She finally succeeds in moving the money to a Swiss bank with the help of her nurse, Jun Hye-mi. Wanting to leave Korea safely with Hyung-joon as soon as possible, Hye-mi was ordered to have Jung-woo kidnapped until they can flee out of the country. Due to an unexpected accident during the time when Jung-woo and Soo-yeon were both kidnapped, they became separated. Jung-woo was rescued from the kidnappers by his father, but he was unable to return to help Soo-yeon, who was presumed to be dead. Jung-woo’s father, wanting to cover up the incident, bribes the kidnappers and the police to fake Soo-yeon’s death. Hyung-joon, however, had saved Soo-yeon’s life and killed a detective that was chasing after them. Soo-yeon then fled out of the country with Hyung-joon and Hye-mi.
Fourteen years later, Jung-woo (now Park Yoochun) is now a homicide detective and has set his mind on finding Soo-yeon, believing that she is not dead. Soo-yeon (now Yoon Eun-hye) is now known as Zoey Lou, a rookie fashion designer who appears to have a bright personality, but she still carries the emotional scars of her past inside her. Fate leads to the meeting of the two, but Zoey is unforgiving towards Jung-woo for abandoning her during the kidnapping. Meanwhile, Kang Hyung-joon (Yoo Seung-ho), rich with the money his mother took from the Han family, returns to Korea for revenge. He appears warm and nice, but turns out to be a psychopathic murderer and uses the alias Harry Borrison to get his revenge on Jung-woo’s father for murdering his mother.