THE DOOR THAT KNOCKED BACK

Create a 45-second, high-quality 3D animated mystery and horror cartoon for YouTube Shorts. TITLE: THE DOOR THAT KNOCKED BACK VISUAL STYLE: Professional 3D cartoon animation, cinematic lighting, mysterious atmosphere, expressive character faces, smooth animation, detailed environments, dark blue and purple colors. Family-friendly spooky storytelling with no graphic or disturbing imagery. MAIN CHARACTER: Leo, a 12-year-old cartoon boy with messy brown hair, blue pajamas and a small flashlight. Keep his appearance exactly consistent throughout every scene. SCENE 1 (0–7 seconds): It is midnight. Leo is sleeping in his bedroom. Suddenly, three loud knocks come from his bedroom door. Leo wakes up and looks frightened. Sound: Knock... Knock... Knock... SCENE 2 (7–14 seconds): Leo slowly gets out of bed, walks toward the door and opens it. The hallway is completely empty. The lights flicker. SCENE 3 (14–21 seconds): Leo turns around. Suddenly, three knocks come from inside his closet. He slowly turns his flashlight toward it. SCENE 4 (21–28 seconds): The closet door opens slightly. A small folded note slides out onto the floor. Leo picks it up. The note says: "DON'T OPEN THE BEDROOM DOOR." SCENE 5 (28–36 seconds): Leo hears his grandmother's voice coming from the bedroom door: "Leo... open the door." He looks confused because his grandmother left the house hours ago. SCENE 6 (36–45 seconds): Leo slowly looks toward the closet. A mysterious whisper comes from inside: "Don't let her in." Leo turns toward the bedroom door as the knocking starts again. Suddenly, CUT TO BLACK. ENDING TEXT: "WHO WAS KNOCKING? PART 2?" AUDIO: Use suspenseful background music, realistic knocking sounds, quiet footsteps, subtle wind and mysterious whispers. Include a clear English narrator and synchronized English subtitles. IMPORTANT: Make the story exciting from the first second. Use smooth transitions, consistent character design, cinematic camera movements and vertical 9:16 composition. Do not include a watermark.