The queen of the human tribe gave birth to twin girls. Respected by the entire tribe, the older sister Qing Kui, who is gentle and kind, is betrothed to the heavenly prince. The younger sister, Ye Tan, smart and cunning, shunned by her own people, is betrothed to the demon prince. Due to a mix-up, the two sisters are married off to the wrong husbands. It paves the way for two beautiful romances and also ignites a conspiracy that shakes the four realms.

When Hong Kong is rocked by multiple gruesome murders, the police forms a task force to investigate. Jun, once a brilliant detective who suffered a mental breakdown, begins his own investigation. Eventually, the police learn that the murder victims are all suspects of cold cases being rubbed out by a figure known as "The Sleuth". Now, Jun and a detective from the task force are on a race against time to beat the brutal killer at its own game.

Young and beautiful single mother Li Meihua uses all her savings to open a bridal shop. Unfortunately, a fire broke out in the shop just before opening day.

Shun (Yao Chen) is the editor of Cosmo, a leading fashion magazine, and is overflowing with enthusiasm for life as she loves her work and is engaged to marry Wu Juyuan (Guo Xiaodong). However, all of the magic is suddenly sucked out of her life when a work oversight leads to demotion and her fiance decides to cancel the marriage. Now working as a warehouse administrator and leading a rocky love life, Shun vows to turn things around and get her life back on track.

The Conquest is a television series based on the conflict between the states of Wu and Yue during the Spring and Autumn Period of Chinese history. The series was jointly produced by Hong Kong's TVB and mainland China's CCTV under executive producers Tommy Leung and Raymond Chai. It was renamed to Legend of the Heroic Duo for the mainland China release, where it aired two episodes every night on Zhejiang Satellite TV from 6 June to 28 June 2006, totalling 49 episodes. In Hong Kong, The Conquest aired five days a week on the TVB Jade network from 18 December 2006 to 10 February 2007, totalling 42 episodes.