It's said that people will have a mask when they come to this world, so that people can't see others' true colours. But the writer Sammy Kwok believe that people can take off their mask and believe each other, and it is the concept of her new book. However, it is contradictory in her mind when she was writing the book. Suddenly, she comes to a world of mask strangely. Sammy started to know about the true meaning of the mask when she saw and experienced everything in this world...