Create a vertical 9:16 cinematic realistic short video, 22 seconds, melancholic and elegant. A woman experiences the quiet memory of someone who did not stay but changed her forever. Start with her standing in a quiet train station corridor watching a blurred person walk away. Cut to a small table with two coffee cups and an empty chair. Then show her holding a phone with a dark blank screen near a window. Then show her looking at herself in a mirror with calm realization. Then close-up of a memory box with a folded note, dried flower, and blurred old photo. End with her sitting by a window at dusk, gently closing a notebook. Soft natural light, muted beige and brown tones, shallow depth of field, nostalgic film look, subtle emotion, no dramatic crying, no romance scene, no text, no logo, realistic hands and face.