What's Wrong With My Princess is first a revenge drama then a romance. There is very little traditional "romance" trappings within the short story but it still manages to demonstrate two people learning to trust eachother and growing closer as a married couple.

Because we are given a front row seat to exactly what happens in her previous life to have her reincarnated back 5 years in the past, it's very easy to be invested in the revenge that is plotted out slowly over the course of the series. Each time the 7th Princess tricks one of the the antagonists we get reminded that they have it coming and more. Meanwhile watching the 7th Prince is no hard task. Seeing him as he supports his wife in her quest for revenge without ever even being told what they "did" to deserve this treatment was refreshing. He came to know her and her values and as such completely trusted that they must have done something truly awful to be treated in such a manner.

The music used was repetitive but soothing and fit the show. The acting was rather good for a short drama with the 7th Princess keeping mostly a poker face but sometimes slipping to show her utter disgust of the people before her when they weren't watching.

As for the last second ending, anyone who knows anything about these types of stories knew the "it was a dream" was coming. After all, it was between that or "it was a story she was writing/reading". That said they slipped the line in so quickly and then moved on that it's truly skippable and doesn't even really change the story we watched since the only dream part was the original life if understanding the line correctly.

Overall the show is absolutely worth a watch. I could even see myself watching a longer version that gave more detail about the backstop and showed them with perhaps a bit more conflict before 100% trusting each other.