Master is the top, disciple is the bottom.
This is a master-and-disciple story, but it's different from the others.
There are several couples in this story, some sweet, some angsty.
The master fell to darkness to save his disciple. Since the Ghost King can only visit the human world once every hundred years, the master searched for his disciple for six hundred years (which was actually only six years).
Theme: Freedom to love, regardless of gender
