The frustrating thing is they followed history. I suppose they had no other choice because the censors would not allow altering historical facts. What would have been better was removing the historical figures and making this pure historical fiction and making Liu Ping a much more decisive emperor. Great story nonetheless.
This is a sageuk drama so you shouldn't expect any skinship beyond holding hands and longing stares. I can't believe people are complaining about the age gap because of possible intimate scenes.