The Empress of China

A young woman born of the Eight Banners' family marries the Emperor. After surviving many murderous scandals and betrayals, she prevails as the most powerful woman in the Emperor's harem, the Empress Dowager. In the process, she transforms from a kind-hearted, clever girl to a power-hungry, manipulative woman.

It is about a lowly singer becoming Empress of Han dynasty
it is a good drama for those who like historical dramas

The dramas follow some of the same historical events that surround the succession of the Tang Dynasty from Emperor Taizong (Li Shi Min), Wu Zetian's first husband, to Emperor Gaozong (Li Zhi), Wu Zetian's second husband.