It was a fine story but not particularly compelling or engaging.  The summary for it is a bit misleading because I guess, yes, Pei Ce was supposed to be an evil spirit.  But you almost never saw any example of it except the one or two times he protected Jian Shu from threat.  Otherwise he was just a distant, reserved, and kind young man who had a vague but tragic backstory.  The author did a good job conveying the distant apathy or distant kindness of a god who spent most of his time sleeping but it also meant that it was hard to accept certain things about his relationship with Jian Shu.  I know you often have to just not ask "why" these people love each other but Pei Ce never feels like he's in romantic love with Jian Shu.  He's so distant, even when we get things from his own perspective, that it felt a lot like the author deemed this relationship so, and therefore it was.
Perhaps some of the subtlety of this story was lost in translation.  There were also a couple of times where the scene shifted very abruptly from chapter to chapter and it felt we were picking up events in the middle of a scene that didn't happen.  It felt like chapters were missing.  I don't know if that's how the story was written or if that's on the translator but ultimately, it doesn't really matter.  The characterization was pretty weak and the story wasn't super interesting so while it could be a nice, simple palate cleanser, it's very likely a month from now I'm going to look at this title and have no memory of even reading this book.