11-year-old brother Canyi (Yu Chenghao) unexpectedly like an adult, meticulous care of his sister Xiaoyi (Jin Xiangqi). Brother and sister have always believed that as long as they obey, one day, the mother who ran away from home will come back to them. Xiao Yi's birthday arrived, in order to meet her wish, her brother gave her a newborn puppy. Xiao Yi thought it was a gift from her mother, so she named it "Heart". With the company of "heart", when Canyi is not at home, Xiao Yi has a playmate. The three little guys live happily like a family. In a twinkling of an eye, "mind" grew up, in a sunny winter day, "mind" pulled the ice cart, with Xiao Yi playing happily on the frozen river, only to have an accident, Xiao Yi fell into the ice hole. Canyi blamed Xiao Yi's unexpected fault on the "mind". She had no mother, no little sister Canyi, and could not accept the "mind" to stay by his side again, so Canyi left home and started a new life. "mind" followed and began a journey of pursuit.
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