It tells both the heart-wrenching love story and the fierce obsession of a king with two contrasting personalities and a female assassin who wants to kill him but ends up falling in love with him. Crown Prince Sajo Hyun is an intellectual who uses his innate artistic flair to work as a fashion designer in a boutique in the city centre, whilst concealing his identity as crown prince. He harbours a deep-seated emotional wound dating back to his childhood, caused by the oppression of his father, Sajo Seung. Sajo Hyun’s other personality, Ak Hee, is a charming character who can easily seduce others, but is cursed to feel extreme pain whenever he physically touches anyone. Yeon Wol leads a life full of twists and turns, transforming from an assassin into a concubine. Yeon Wol is the royal descendant of the fallen Yeon dynasty and the only daughter of Yeon Poong Hak. Yeon Wol hides her identity and becomes the assassin Gye Ra to avenge her family. Whilst attempting to assassinate the king, she falls into a trap set by a stranger and wakes up the next day with no memory of her past.