Huang Zekai, an ancient boy who just lost his mother, and Liang Yuan, a modern female college student, came to a dreamland on the night of the Mid-Autumn Festival. From then on, Xiaokai would see Liang Yuan every full moon night.
In the dream, Xiao Kai continues to grow up, but Liang Yuan seems not to have aged. Ten years of dream companionship has transformed them from strangers into confidants. The grown-up Xiao Kai also begins to examine his feelings for Liang Yuan.
Will they only meet in dreams forever or will they meet in reality one day? On the Mid-Autumn Festival night of the tenth year, Xiaokai failed to confess his love, but on his way home the next day, he met a "Liang Yuan" who didn't recognize him...