Grandpa Taught Me to Exorcise Ghosts, So I Used It to Build an Aircraft Carrier

"Good grandson, good grandson, want to catch a ghost with Grandpa and play?"

"Grandpa, Mom says there are no ghosts in the world. We should believe in science."

"Grandpa, are there really ghosts in this world? Why can't we see them?"

"Ghosts are the people their loved ones meet. Once you solve this prophecy, 'Five stars shine as the constellations transform; the ancestors appear and decide the fate of the world; the heavenly gate opens on the road to the heavens; across the stars, we battle for nine days,' you'll be able to see them."