During the reign of Emperor Shang of Tang, Prince of Ping (
Steven Ma), and Princess Taiping (
Alice Chan) stage a coup and execute the Empress Dowager Wei (
Michelle Yim) who was seize power on the court system. They support Prince of Xiang (
Lung-Kay Lee) in reclaiming the throne. The palace appears to be returning to peace, but, the great waves are secretly approaching - On the court, the aunt-nephew camp of Princess Taiping and Prince of Ping begin to be divided and become like fire and water. Within the inner palace, Prince of Ping's first wife, Wong Zhen (
Ting-Yan Wu) and favorite concubine Zheng Chunxi (
Chrissie Chau) compete with their beauty and cannot get along. Fortunately, within the deceitful inner palace, there is rare integrity. The heroic and righteous imperial guards, Yam Sam-Shu (
Kwok-Ming Ma) and Ho Lei (
Edwin Siu), and the quiet and elegant department heads, Kam Yeuk-chin (
Jacqueline Wong), and Yuen Yuet (
Annie Liu), are four genuine people that decorate the gloomy and cold palace halls with a brush of romance and add a little mystery - Some people will give up everything for their most beloved, while others will give up their soul for power. A series of unsolved cases occur in the palace. Within the layers and layers of mystery is a long-kept secret. As it is slowly unraveled, it reveals humanity's deep thirst for power and wealth.