To be honest, I watch for this couple only and only because of this couple I watched it till the end.
I'm pretty sure the leads also feel the same with the weak storyline as I have heard them complaining about the plots a few times from some behind the scenes clips. I'm guessing they are obliged to finish what they started in the Legend of Yunxi and to give this couple a beautiful end. The production is better than Yunxi, gorgeous scenery and costumes.
I absolutely adore this couple, I can't explain why, their chemistry is strong, very pleasing and comfortable. They don't need steamy kisses to seal the deal.
I'm also loving the special modern episode which gives of a vibe like The Eternal Love 2 or even Goblin. Of course most of it makes no sense since it's only a short special for fan service. I'm not gonna complain since the ending bed scene was super sweet.
I definitely hope they will collaborate again with better storyline.