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I think the first part is about the ghost realizing his destiny no longer involves him actively being a part of her life, but also realizing that he will never completely fade away from her memory, so he's saying farewell as the sun rises.
I think the first part is about the ghost realizing his destiny no longer involves him actively being a part of her life, but also realizing that he will never completely fade away from her memory, so he's saying farewell as the sun rises.