The song "Letter" by Justincase tells the story of a person who has decided to end a relationship and is expressing their reasons for doing so through a letter. The lyrics highlight the individual's intentions to not hurt their partner but believe that it is better for both of them to part ways. The protagonist acknowledges that the decision may take time for their partner to process and reassures them that it is alright. They emphasize that they have carefully thought about their choice and have written down all the reasons behind it. The song also touches upon the differences between the two individuals and how there are certain things that the protagonist simply cannot do, despite their efforts. They affirm that they have tried their best but recognize that it is not compatible with their preferred way of living. The chorus conveys the protagonist's indifference towards their partner's opinion, stating that they no longer care if they are seen as being in the wrong. They assert that sometimes relationships don't work out and it is time for their partner to move on. The lyrics further reflect on the journey of their relationship, stating that they have reached a point where the initial spark and excitement have faded away. The protagonist admits to losing the desire to be with their partner the way they felt at the beginning. Ultimately, the song portrays a bittersweet and reflective narrative of a person who has made the difficult decision to end a relationship for the betterment of themselves and their partner.