Hope and Harry, friends since childhood.
Hope's lost hold of her feelings towards her superstar best pal, and decides to keep a diary to let her emotions run wildly away from her head for a bit.
Harry has let go of the feelings, and has tried to let go of Hope as well. He doesn't want the famous life to take her, he feels like she's too special for that. But at the same time he's consumed by her as well... So he writes these letters. Letters for Hope he knows he'll never send. But it gives him the closure he needs.
But writing away secrets can't last forever.
And eventually, things find a way to reveal themselves.