"Ruyi, a fashion magazine photographer, lives with her elder sister Ruxing, a detective fiction author. Ruyi has inadvertently photographed a couple making mad passionate love. Few days later, she finds the woman has married with another man. Ruyi shares her secret with Ruxing who is suffering from writer's block. The two sisters begin to observe the couple; gradually Ruxing even writes some of her observations into her novel, without letting Ruyi know it.The more they watch the couple, the more details they'll get. And Ruyi will find that the truth far exceeds her imagination..."
Quoting the synopsis from the 2010 Tokyo International Film Festival site.