A writer who has not written for years is looking for a tenant to share a spare room in his house. One day, an actor comes to rent the room. His clear and innocent eyes have evoked the writer's interest. When the writer finds out that the daily life of the actor is a performance in itself, he begins to refer the new tenant as the blueprint of his novel.

After a long day at work, Cai returns home as usual, only to find out that his mother, who suffers from Alzheimer's, has disappeared. In vain, he looks for her everywhere. Worried and not knowing what to do, he posts an appeal for help on a social networking website. In one single night, his life is going to change.