Changmin and Jessica, they have a pink colour in their love. They knew each other since their early childhood and then grew up together. Whenever Jessica went, Changmin followed, as if there was a string pulled them together and it was strong. Jessica came from a wealthy family background, while Changmin was just an average boy-next-door. Though Jessica's parents were not fond of their daughter's relationship with a commoner but since she was really stubborn, they finally approved of them. Jessica then got Changmin to wed her as soon they graduated from university. Changmin worked in an insurance company and Jessica decided to be a housewife for the time being, she had been dreaming about it since she was a kid.

On the other hand...

Junsu and Ri In, they have a grey colour in their love. They knew each other since high school and became a couple during that time. They were known among their friends as a perfect couple. They were always sweet and caring for each other. They got married after they graduated from university. Junsu ran his own company, taking over his father's production company. Ri In worked at an insurance company that belonged to her father. They were happy until something happened - Ri In got miscarriaged, twice. Eversince, seemingly they were living in their own worlds.

Until one day, Changmin met with Ri In and Junsu met with Jessica...