Drama Special Season 6: Crimson Moon (2015)

The Red Sleeve tells the story of the son of Sado who is the main focus of Crimson Moon.
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Another true story about Prince Sado. Both were sad and depress. Great casts and grest acting overall

Both are historical drama specials, one of which tells the story of Prince Sado and the other of which tells the story of his son Prince Yi San dealing with the aftermath of his father's legacy.