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Jin-woo, a 29-year-old AI CEO driven by cold logic, becomes the sudden guardian of his grieving 5-year-old nephew, Hajun. Their rigid world shifts when they move into Gleam Tower and meet Eun-soo, a 25-year-old kindergarten teacher. Secretly a Chaebol heiress hiding her elite status, Eun-soo uses music and kindness to help the silent Hajun heal. As their lives collide in the classroom and elevators, the stoic CEO and the undercover heiress begin to drop their guards and find a new melody.