The Story of Twenty-Nine.

Yuan Pei, a full-time wife, accidentally discovered that her husband Zhuang Hao is cheating. She decides to confront his mistress, Lu Xiao Shan, who is working in a luxury store. But after meeting the woman, she has change of heart and decides to became a colleague with her. At the same time, Xiao Shan plans to end her affair as she begins to realize that their relationship is getting more and more risky. Soon, to their surprise, the two women starts developing a sincere bond and friendship.