丁凯乐(小名乐乐)是现实生活中某小学四年级的学生，像中国大多数10岁左右的孩子一样，他的生活平静、普通而且按部就班。但是由于他的性格内向、胆小怕事，在学校他经常被班里几个调皮的同学金刚、胖哥和小九九欺负，乐乐惹不起他们，只好忍气吞声……
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