I could watch this every 3 months because it is the epitome of a great drama that encompasses perfect writing, beautiful cinematography, and characters with more layers than a mille-feuille. It's also one that gives the most believable depiction of the Qianlong Emperor unlike Ruyi's Love in the Palace which became all about Ruyi's martyrdom.
Also, I wonder why there aren't more strong female characters like Wei Ying Luo because if the viewing numbers are anything to go by, it at least tells us that audiences want a heroine who can triumph over adversity by the sheer power of her intellect and yet C dramaland is littered with the ghosts of limp-noodle, baby voice heroines who can't find their way out of a paper bag.

Anyway, watch this if you like a fast-paced and unpredictable plot with multiple strong female characters.