Late one night, the antique clock downstairs struck thirteen times, and a strange thing happened-the backyard, which was usually full of trash cans, turned into a mysterious summer garden. In this mysterious garden, Tom has neither footprints nor shadows, and can walk through the wall. He can see others, but no one can see him. Only Heidi, a little girl whose parents are dead, can see him, but she thinks he is a ghost. Strange things always happen here, time goes back and forth, seasons or winter or summer, Heidi puzzles him from time to time, no matter how long he wanders in the garden, every time he returns to his bed, he finds that time has passed only a few minutes than when he left. Here, the pace of time seems to be in a hurry, Heidi's growth rate is unusually fast, while Tom's image is becoming more and more blurred. Can Tom keep all this beautiful psychedelic? He had to figure out a way to have time in both worlds at the same time.