shaky cameras. maybe i'm prone to dizziness, but I could not keep up in normal scenes, let alone fight scenes. i squinted through the episodes solely for ji chang wook lolllll yoona's acting was subpar but she has the looks, which in a lot of people's minds makes up for the lack of emotional depth in her character. the real acting is in the evil stepmother, her character had so much potential like heck, she could have ended up with the male lead. but anyhow, really shaky cameras. i watched all episodes on my phone when it first came out and barely made it through them, now that I have a gigantic monitor, absolute nightmare to keep up with.