Hao Cheng's schoolbag. The story of Snail Without Shell mainly tells how Hao Cheng lost his schoolbag. There are several versions of the story. This story has been told several times. At first, Hao Cheng was ashamed, and his classmates made fun of him many times. Then, Cheng Hao became more and more familiar with storytelling skills and became a storyteller holding the stars of the moon.