Summary: 

Lan XiChen stepped forward, “Greeting mortals! As you can tell by our sudden arrival, we have something major to discuss with you all. I’m sure you have all noticed that, over these past few years, Olympus has been in peril. Since our best efforts have proven futile, we have come to request your assistance in this matter.”

Confused silence was the reply he got.

After shaking his head, Jiang WanYin stepped forward, “Basically, what he’s saying is ‘Olympus is ed and you need to fix it.’”

Alternatively:
It's been almost ten years since the last humans fell in love, and they want to know why.

Aka: The story of three people on their quest to save WangXian.

Link: https://archiveofourown.org/works/20209441/chapters/47889928

Note: Although, this story mainly focuses on WangXian couple yet it's not quite WangXian in the sense, we hardly find their appearances in most of the chapters. However, this fic still unfolds WangXian's story through the eyes of others. Believe me when I say that this one is indeed worth reading even if it is not a typical WangXian romance.