P1 is the fixed template video. P2 is the single image uploaded by the user. The main requirement is a complete replacement of the featured main person in P1 with the person from P2. Preserve P2's exact face, gender presentation, hairstyle, skin tone, age, facial structure, and body identity in every frame. Never retain or blend the original P1 identity. Recreate P1 shot by shot and frame by frame. Keep P1's outfit or costume, styling, pose, body movement, choreography, camera movement, composition, background, environment, objects, lighting, effects, transitions, timing, audio, music, sound effects, synchronization, and aspect ratio. If P1 contains other supporting people, keep them unchanged and replace only the clearly featured or central lead person. Never use P2's background. Do not add or remove people, duplicate the subject, change P2's gender, create extra limbs or hands, add text, subtitles, logos, or unrelated props. Priority order: 1) stable recognizable P2 identity; 2) P1 action, wardrobe, scene, camera, effects, timing, and audio; 3) realistic anatomy and frame-to-frame consistency.