Liu Xing and his classmate Mouse did not pass the stage exam. The papers should be signed by the parents. Because they were afraid of punishment, they signed each other's parents' handwriting.
刘星和同学鼠标在阶段考试中都没及格,试卷让家长签字,因为怕挨揍,他们两个互相模仿对方家长的笔迹签了字。被老师看出请来家长。林的父母禁止鼠标再和刘星接触。鼠标说如果再被家长迫害,他就离家出走!于是刘星积极为鼠标设想种种出走的路线和方案。又考试了,在巨大的压力面前,他们作弊了,又被请了家长。刘星挨了揍,而鼠标却真的离家出走了。