I Picked Up a Ghost from Republican-Era China

Here's the blurb: Some girl does something stupid and goes exploring in the mountains with her classmates. They enter a cave and stand on a tombstone. When she gets back, she finds a refined and well-mannered... ghost by her side. And this ghost wants to marry her? What the heck? The refined and well-mannered ghost: Well, the girl stood on my tombstone of her own accord. You could say she delivered herself right to my door, so I'll keep her. > A guide before you dive in: 1. The blurb is temporary. I haven't decided on the main characters' names yet. I'll revise them as I write, but the story won't change. 2. The author's IQ isn't high enough. If there's anything shocking, bring your own lightning rod.