This drama is based on Chinese novel “Bu Bu Jing Xin” by Tong Hua which was originally published online in 2005 on Jinjiang Original Network. The novel also adapted into the chinese television series “Scarlet Heart” which was aired in Hunan Broadcasting System (HBS) from 2011-Sep-10 to 2011-Sep-29 and also “Scarlet Heart 2” which was aired in Zhejiang STV (ZJTV) from 2014-Apr-22 to 2014-May-07. This drama was fully pre-produced before airing which is a departure from the live-shoot production format that characterizes most Korean dramas. The Filming Began on 2016-Jan and Completed on 2016-June-30. The series will be simulcast in China. The story set up in the early of Goryeo regime. Hae Soo (IU), a 25 year old girl from modern era got transported back to Goryeo dynasty and got trapped in the conflicts and struggles between princes of Wang’s House. There, she falls in love with Wang So (Lee Joon Ki) who makes other people tremble with fear.