"Letter" is a song by South Korean singer Jung Yong Hwa. The song tells the story of a deep, everlasting love between two people. The lyrics reminisce about a time when they fell in love like a shooting star, and how being together makes everything shine. They express their desire to always be by the person's side, even during rainy mornings and starry nights. The song also highlights the warmth and comfort they feel when their love is intertwined. Despite facing challenges and getting hurt along the way, they realize it's all worth it because they long to see the other person's smile. They vow to continue walking hand in hand, even as they grow older and wrinkles appear. The lyrics convey a sense of eternal love and companionship, expressing the desire to stay together until the end, even in the eternal sleep. The chorus emphasizes the singer's inability to live without the person and their intention to continue writing love letters, symbolizing their commitment to nurturing their love. The lyrics express that their love will never fade and that they will continue to shine a light on the other person, whether in dreams or memories. The song portrays a deep and enduring love that transcends time and challenges, demonstrating the singer's unwavering affection for their beloved.