This is a really nice mini-show. The storyline is funny, interesting and romantic - and a bit sad too.
Character wise:
FL is a peppy princess that is set to inherit the throne since both her brothers - due to a conspiracy - are deemed unsuited to be emperor.
ML is a mysterious man that approaches and marries the FL with his own agenda.
Acting wise this is set in a comical tone so the acting might sometimes be a little exaggerated. I believe that is what the show is aiming for. The main couple are really nice to watch and I appreciate that they are not mainstream actors (overly thin and beautiful/handsome).
Well, if you like something short and funny - with a twist in the end - this is actually worth watching.