Well, the title of the new drama references a famous event during the Warring States period involving the Tiger 'Amulet' of Wei, which basically gives military authority equivalent of the Wei emperor to whomever holds it. Historically, the Wei emperor's concubine Ru stole the amulet to give to Xin Lingjun, a prominent (not noble but something similar) political mover-and-shaker in Zhao, in order to fend off Qin (of Qin dynasty fame). This sort of thing, of course, was frowned upon, and when the Wei emperor threw the expected hissy fit, Concubine Ru replied that she did this in service of both Wei (to weaken a potential conqueror) and to avenge her father, who was a regional lord, and presumably killed in battle before she was married to the Wei emperor. Later, after the emperor sends her to the 'cold palace' (don't know if there is an English equivalent), she commits suicide at her father's grave.

Err... in this version the story is that Concubine Ru (Yang Mi) was in love with Xin Lingjun (Feng Shaofeng), but somehow married the Emperor of Wei instead and I'm guessing all the incipient tragedy follows.

In summary: they're playing star-crossed lovers in period Chinese drama - tears guaranteed.