It's Not Easy Being the Crown Prince's Concubine

I'm a clueless office newbie from the twenty-first century, a humble graphic designer, and somehow I've transmigrated!! Fine, I've transmigrated, but why does everyone else become a princess consort or a princess, or at the very least a wealthy young lady? As for me, I transmigrated straight into the body of an unfavored concubine from a brothel. And what's with this Crown Prince? Keep your distance and stop getting in the way of me taking it easy and enjoying the happy life of a homebody!