When I heard my mother mention Runtu, a "miraculous picture" suddenly flashed through my mind, "I seem to have seen my beautiful hometown": in the deep blue sky... I escaped from his crotch. This picture is the illusion of a beautiful childhood in my memory; And half of my return to my hometown is also to retrieve the beautiful memories that have already passed away, but it cannot be because that "hometown that I always remember" is just an illusion in the world of mind. That beautiful and supernatural picture is actually a dream that "I" imagined with a childish heart in my childhood, according to the description of Runtu. "I" is just like my usual friends, "only seeing the sky at the four corners of the high wall in the yard.".