Twin Hearts

What will you do if your heart has been broken, not once but twice?
First was when your parents died on a horrible accident when you were a fragile little girl.
And second when you thought you were fully healed from the wounds of the past and ready to be with the man whom you spent your childhood with, the one who chases your nightmares away and the one who made you believe that "Happy Endings" and "Happily Ever-Afters" do exist, then he was taken away from you?
Marguerite was only 11 when her parents were taken away from her. She never thought she would recover from the pain. But there was this boy who made her live again despite of not being able to see the beauty of the world.
Scott is a positive boy. He always brings sunshine to a gloomy day.
Marguerite and Scott became friends. And eventually, they fell in love. As time passes by, their relationship grew stronger. And on the night before their wedding day, Marguerite received a call from Scott's parents. Scott and Devon had a car accident. They were both severely injured. Scott donated his heart to his twin brother so he could live again. But made Devon promise on his deathbed to continue loving the only woman he loves and never made her sad.
Will Devon fulfill his twin brother's wish? Or continue to be a ruthless person that Marguerite thinks?