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Dongdong's father financially supports the family with low wages alone. However, he quitted his job in order to retain his colleague's job, because he sympathy her, who is a single mother. This made their living became worse, and drove his mother left with her past lovers. To earn living, Dongdong has to work with his father and lost the chance of schooling. Missing mother drives them nuts, and they decided to go to Dalin to find her. The journey of searching mother begins.
