No Makeup and Clear Water

He is just an ordinary office worker. One day he receives a postcard from his high school sweetheart. His memory and reality are entangled. Can he find her? Can the age be changed by turning the hourglass upside down? The yellow leaves flew away, the green pines turned into dead branches, and the faded memories burned for a period of time. As time goes by, will the innocence of childhood become awkward when we grow up?