I got the impression that the main arc of the series was the relationship between Cang Xuan and Xiao Yao.
Who never had a romantic relationship together, despite the fact that they loved each other, and were a perfect match in term of characters.
That's why this series is so weird. The man FL loved the most was the only one who never tried to get romantically involved with her. :P
Two men were proposed to replace him, to give her the emotions that ML couldn't offer her. Fans argue mostly about the two "love interests" of FL, which one is her "true love", because the most important man in her life decided to not even enter the love game (the reasons for this were already much discussed).
Xiao Yao thought that Cang Xuan was incapable to have romantic emotions, so she kept that part of her heart closed for him, since the very beginning. Still, she seemed to be frustrated by this. Also, she tested him a few times, but he kept proving consistently that he has no romantic feelings for her (how could he marry other women, and throw her in the arms of men, otherwise?) So at the end, she got to know his real feelings towards her too late.
I usually don't watch this kind of stories, which is about misunderstandings between FL-ML till the end. But I was curious to see Zhang Wan Yi as a cold, ruthless, negative character. Only to see that he wasn't that at all. :P