The Empress Dowager Cixi also appears in Nothing Gold Can Stay, although she plays a very bit part only.
Just like Mei Ren Mou Lu, The Imperial Coroner is a mystery drama set in Tang Dynasty with a little romance as well.
Legend of Concubine Zhen Huan is set in the very same period as The Yong Zheng Dynasty, and Yongzheng himself is one of the main characters.