"I was just supposed to be a stand-in princess… so how did I end up being adored!?" Tomboyish village girl Yiyi, who prefers dumplings over flowers, learns on her foster parent's deathbed that she was actually born into a prestigious noble family—and that she has a twin sister. Determined to meet her long-lost sibling, Yiyi sets off for the imperial harem where her sister is said to be living as an imperial consort. But upon arrival, things go awry: instead of becoming a lady-in-waiting as planned, she somehow ends up assigned as a military officer!? To make matters worse, her commanding officer is a cold and stern-looking general... Thus begins the first volume of a romantic tale of swapped identities in the imperial court!