Spoiler about Ray's appearance & what happens with the couple
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I believe after Ray meets some elves and goes through a trial he figures out how to get back to his old body and appearance. He does eventually go back to ruling his country, but Jiskar also continues to rule his country. The pair are still together, but also sort of not together? They continue meeting with each other, and continue to have a relationship, but neither one can give up on what they are meant to do (ruling their respective countries). And they also have separate lives in their own countries. It's not really a happy or a sad ending, and they don't really end up together nor do they really break up. It's a very realistic, kinda bittersweet ending. However the manhwa could change things, as there have already been some deviations from the novel.