Cheng Yuelang who was born in a middle-class family is thirteen years old. However, her parents are on a tight rope, they often quarrel and are also indifferent to her, they are not close to each other.On one occasion, Cheng Yuelang accidentally heard the contents of their quarrel and began to doubt her own origin. She is almost disintegrated. She is thirteen years old and at an important stage of growth, she become more sensitive and thoughtful in this puberty. How would she spend this time full of confusion and puzzle and filled with pain and tears?