Ok, the problem with this is he says he is a Prince when in fact he is a King now. So this must before Snow and David take the kingdom back.
Well technically he was never a prince. But he is Prince Charming, so he’s telling the truth, in a sense.
The press release says it’s the lost year, David is just simplifying.
Meanwhile, in the Fairy Tale Land that was in the previous year, Prince Charming stumbles upon Rapunzel,
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"He was a lot of things to me" "The only conclusion was love"