Young-Chan hails from the “planet of snail,” a place where individuals who are both deaf and blind lead lives marked by tranquility and slowness. Upon arriving on Earth, he found himself isolated, as no one could comprehend his unique way of communicating, leaving him in despair. His life took a turn when Soon-Ho, who understands the depths of loneliness, entered his world and quickly became indispensable to him. Through her support, Young-Chan discovered the wonders of braille, opening up a new universe of literature at his fingertips. This newfound ability sparked his ambition to author a book. However, Soon-Ho faces her own challenges due to a spinal disability, which means she cannot always be by his side. The couple must now learn to navigate life independently. As Soon-Ho anxiously awaits his return on her first day alone, Young-Chan embarks on the most significant adventure of his life.