Bo Huairou, a female border guard wearing armor and holding a sword, galloped along the snow-capped mountain border on a Juechen horse. She had guarded the border for many years, but because of a conspiracy twelve years ago, she was involved in the life-and-death struggle in the palace. The wise but foolish concubine prince has been distinguishing right from wrong for twenty years, living in a web of lies spun by his father.
After Bo Huairou rescued the enemy country's "Xi Zuo", he watched helplessly as he returned to the palace and became emperor! In order to find out the truth about the conspiracy that year, she was willing to be with this cowardly chosen one, but she didn't expect that he was a heartless and unjust person.
