Wang Cuihua, a modern social creature, accidentally travels into a novel and becomes Yu Wanyin: an evil concubine who brings ruin to the nation. She and the tyrant Xiahou Dan, a fellow time traveler, form an alliance. The two battle with wits and courage against various obstacles. Eventually, with their combined effort, they reform tyranny and fall in love along the way. However, the hidden truth is gradually revealed and Yu Wanyin is shocked to discover her arrival is actually the catalyst to Xiahou Dan's redemption…