What do you do when the person you need to forget is the only one you can't let go of?

Will and Rosie meet when they are teenagers.
They are completely opposite characters: she is over-analytical; he is the rebellious and unpredictable best friend of her twin brother. However, through secret outings and late-night phone calls, they grow closer – their love story is destined to leave a mark on them forever.
Until one day their shared future is shattered.
As the years pass, Will and Rosie's paths cross again and again, reigniting each time the spark for what they could have been to each other.