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The prince said that Xai Xu's mom was part of the royal family so I think that Xia Xu's dad was the king and he had sex with Xia Xu's mom and had Xia Xu. The prince's mom was another woman and maybe the king harassed Xia Xu's mom and she left leaving Xia Xu to be homeless. So the prince and Xia Xu might be Half-brothers... CORRECT ME IF MY GUESS IS WEIRD （ﾉ´д｀）