Hei Hei is a mischievous little boy. He loves his sister Wen Fei and he loves Grandmother. They are not always able to see that Hei Hei is not a baby anymore.
One day, Hei Hei and Wen Fei have a fight. What will Hei Hei do? How will the family react to Hei Hei's new little friend?