Kai Yi and Xing Yan were not characters from fantasy novels. They came from different web novels and comics. Kai Yi was a fictional character from the original Gods. She was a Battle Mage with outstanding magical abilities and powerful combat skills. Star Flame was a fictional character from " Battle Through the Heavens ". He was a genius alchemist and a powerful martial artist with a unique fire skill. There are other sources for Kaiyi and Xingyan, but they are all fictional characters, not characters in fantasy novels.