Ling and Lan Fan do love each other but Lan Fan was too loyal to Ling and the house of Yao to ever act upon it. Ling proposed to her, asking her to rule with him but her duty wouldn’t let her stop being his bodyguard. He did not ask again but he never married anyone else. In the end, he had the son of Al and Mei succeed him as he had no children of his own.
Submitted by goodnight-raggedyman