宋朝时期，刁蛮任性的少女柳月虹（张柏芝饰）邂逅书生陈季常（古天乐饰），两人一见钟情。在苏东坡（许绍雄饰）举办的诗词会上，两人再次相遇。皇帝当场赐婚，柳月虹搬进了陈府，在陈府，柳月虹要求下人称她为女主人。婚后，柳月虹对陈季常管束非常严格，导致陈季常在一帮朋友面前没面子。一次，月虹帮父亲走镖，离家数日。苏东坡拉着惧内的季常喝酒玩乐，一直仰慕季常的郡主（范冰冰饰）假扮成兔仙，和季常发生了一夜情。月虹思念季常，走完镖第一时间就赶回家和季常团聚，却不知家里已经发生了天翻地覆的变化。郡主不甘心于一夜情，她依仗自己金枝玉叶的身份上门逼婚，皇帝也施压压力，逼月虹同意和郡主共事一夫。月虹无法和别的女人分享丈夫的爱，最终大闹皇宫，激怒了皇上，月虹万念俱灰之下，喝下了忘情水

During the Song Dynasty, Liu Yuehong (Cecilia Cheung), a wayward girl, met Chen Jichang (Gu Tianle), a scholar, and they fell in love at first sight. At the poetry meeting held by Su Dongpo (played by Xu Shaoxiong), the two met again. The emperor bestowed a marriage on the spot, and Liu Yuehong moved into the Chen Mansion. In the Chen Mansion, Liu Yuehong asked the servants to call her mistress. After marriage, Liu Yuehong was very strict with Chen Jichang, causing Chen Jichang to lose face in front of a group of friends. Once, Yuehong helped her father run darts and left home for several days. Su Dongpo pulls Ji Chang, who is afraid of guilt, to drink and have fun. The princess (played by Fan Bingbing), who has always admired Ji Chang, pretends to be a rabbit fairy and has a one-night stand with Ji Chang. Yuehong misses Ji Chang, and rushes home to reunite with Ji Chang as soon as she finishes the dart, but she doesn't know that earth-shaking changes have taken place in her family. The princess was not reconciled to a one-night stand, relying on her status as a golden branch and jade leaf, she came to force the marriage, and the emperor also put pressure on her, forcing Yuehong to agree to work with the princess as a husband. Yuehong couldn't share her husband's love with other women, and finally made a big fuss in the palace, which angered the emperor. In despair, Yuehong drank the water of forgetting love