Write a fanfiction where a character receives an old, lost letter from their deceased loved one.
The ambiguities in the message and the emotional turmoil of receiving a letter from someone no longer in the world leave the character in a whirlpool of feelings. How does the character respond to the letter? What do the words say and what hidden messages or unspoken emotions do they hold? Delve into themes of love, loss, regret, and unresolved emotions, while providing insightful thoughts on nostalgia and remembrance.