Imo, Cang Xuan was the most important man in Xiao Yao's life, but he was inaccessible as a romantic partner, so she went out seeking romance elsewhere. But two men weren't enough to replace the romantic feelings that Cang Xuan (apparently) couldn't offer to her. At the end, when the misunderstanding was cleared (that she was the only woman in his heart), it was too late, as she has already found a substitute for the romantic feelings that she missed. But she wasn't beaming with happiness at her wedding, and the series didn't show a happily ever after with poor Jing. Instead, they closed with the sentence that Cang Xuan and Xiao Yao are bound to meet one day.
