I'm not sure which novel you're referring to because the term 'young era novel' isn't a common online term. If you can provide more specific information or context, I will try my best to provide you with a more accurate answer. At the same time, regarding the ending of Lan Jue and Xi Cheng, according to what I know, they didn't end up together and developed their own stories. As for Nile, his ending was uncertain, but it was possible that he was burned to death along with the other characters. It was also possible that he was not burned to death. The specific situation still needed to be speculated according to the plot of the novel.