A former street orphan, Dian, works as a maid for Marquis Rowen's daughter, her benefactress. Her lady is forced to marry a man 20 years older than her, so Dian help her escape by sending her out of the country and falsing her identity, taking her place instead to Margrave Evenhart's castle. The Evenhart family is known for guarding the North without ever leaving their territory, and they're a subject of great mystery to the outside world. Will Dian’s identity be discovered? What romantic story is going to unfold over these days of cohabitation?