You need to give it a shot, even if you don't know the actor or actress. The FL is a rising star and she probably will be one of the main female lead star in more dramas to come in a year or 2. ML is good, I really like his acting in this as he cross-dress as a female which rarely makes me laugh out loud as heck. The serious tone of the show is also on point, the plot is kinda cliche but still refreshing in a way. Don't give up on watching this just because you either hate one of the cast or don't know them. If you are like me, you will grow to love them. I like the female lead, watch almost all her dramas that shes in even if she is secondary characters. I am currently rewatching it after a few months. And it has a Happy ending which is kinda rare for a joseon drama!!!