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For 24 years, a young man has lived trapped behind an invisible glass wall, used as an experiment and known only as Subject 404. When the laboratory is abandoned, everyone forgets about him. Years later, Mei, a shy young woman exploring the building, discovers him. For the first time, someone can see him. She gives him a name—Yuri—and promises to return. What begins as a simple act of kindness slowly becomes something much deeper: a quiet love story about trust, healing, and two lonely people .