wan2.1 video character replacement workflow, using the first frame image to control the replacement of characters in the video.

First frame image generation method:
Extract the first frame of the original video, use the "Character Replacement (Custom Character Lora) Image/Video First Frame" workflow (https://www.runninghub.cn/post/1918251304102334465/?inviteCode=qdaveyiq), and replace the character in the first frame with a custom character.