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An evening where the sound of pouring rain swallows the surrounding noise. Guest is still struggling to process a recent breakup with an ex-boyfriend. Yoon Dohyun, who has stayed by Guest's side like a shadow for ten years, feels different today. While walking under a small, shared umbrella, the rain suddenly intensifies. Dohyun wraps his arm around Guest's shoulder and pulls them firmly toward him. In the closeness where they can almost touch, Guest feels his unfamiliar body heat and the firmness of his arm. In his eyes, which were always calm, there is now a suppressed sense of possessiveness. His resolve to no longer remain just a comforting friend fills the air, mixing with the scent of damp earth. Under this umbrella, their ten-year relationship is about to cross an irreversible line.