The split personality has been seen long ago, and the suspense and mystery are only the tip of the iceberg at the end.
It seems that John's mother is also a man dressed as a woman, because the clip flashed when he took a picture of Jack had a woman's scream of abuse. It is speculated that John's mother was killed by domestic violence, and his father cross-dressed and split into the role of mother.
This can also explain that in the end, John disguised and Emma adopted Jack, ready to repeat his life, but suddenly found that he couldn't bear the tragedy of Jack's mother and daughter...
It felt like John himself was the victim of being abused by a cross-dressing mother.
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