I recommend "Coffin Lifting", a mystery detective novel. Although there was no explicit mention of the Four Ghost Kings, the novel involved Ghost Kings and powerful ghosts. The protagonist even used himself as a seal to barely seal the Ghost King, so it could be considered. In the novel, the protagonist and the male protagonist traveled together to find the coffin. They broke through the thorns and cut down the evil path. I hope you like this fairy's recommendation. Muah ~π