The shadow can talk, be happy, be sad, and love people.
You said that everyone on your planet writes love letters, but here you write to the person you love the most, and he is not anyone else.
You have been to countless planets, and you can stop and go countless times for me. Each planet will not be special, but you say that the blue planet is special, not because you have been for me thousands of times, nor because you have a name, but because you fell in love with me on this planet.
Concept: A love letter from another planet