Joon-gi Lee lost 30 pounds for his role Wang So.
Byun Baekhyun that plays the 10th prince is part of the popular kpop group EXO.
Based on Chinese novel "Bu Bu Jing Xin" by Tong Hua (originally published online in 2005 on Jinjiang Original Network). Chinese 2011 Hunan Broadcasting System (HBS) drama series "Scarlet Heart" ("Bu Bu Jing Xin") is also based on the novel.
Early working title was "Dalui Yeonin" ("Moon Lovers") then changed to "Bobogyungsim: Ryeo" ("Scarlet Heart: Ryeo") before picking up title of "Dalui Yeonin - Bobogyungsim Ryeo" ("Moon Lovers: Scarlet Heart Ryeo").
Ep.16 was originally scheduled to air Monday, October 17, 2016, but, due to a baseball semifinals game, ep.16 will air Tuesday, October 18, 2016.