Do not belong on the Period list:
Rookie Historian, Iljimae, Jewel in the Palace, The Tale of Nokdu (Some of these are highly fictionalized, but there are real historical figures/backdrops, and to my understanding, historical accuracy is not a precondition for being on the Historical list.)
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Do not belong on the Historical list:
The King's Affection, Love in the Moonlight (Correct me if I'm wrong, but I believe neither of these dramas are set against any real historical backdrop.)
The Rise of Phoenixes (not set in a real dynasty), Love and Redemption (xianxia)
Dramas I'm not sure about (either I haven't watched them or don't remember well enough, if other people would weigh in on these, that would be great): The Story of Ming Lan, The Longest Day in Chang'an, Arsenal Military Academy, Story of Yanxi Palace, Queen: Love And War, The Princess Wei Young, The Romance of Tiger and Rose, Rookie Agent Rouge, My Roommate Is a Detective, Sparrow, Goodbye My Princess, 100 Days My Prince, Splash Splash LOVE, Killer And Healer, Fall In Love, The Disguiser, any of the Japanese or Thai ones