It is still an original theme. “Original Theme” usually refers to themes that aren’t tied to any pre-existing IP. So even if this theme will be an adaptation of Journey to the West, it will still technically count as an original theme.
Not to mention, I highly doubt this theme will be more than a loose adaption of Journey to the West at best. It could very easily turn out to be another vehicle-based theme that barely has anything to do with the source material.
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