Cheng Wanwan, the treasure of the Chu Kingdom, is responsible for the mystery of the hairpin and the secret message. In order to save her biological mother who was imprisoned in Yue Kingdom for ten years, she used the pseudonym "Xiaotang" to deal with enemies. When the concubine in the palace is struggling to her death, the counselor who is obsessed with the king is stained with blood on the steps. When the green plum withers and the concubine commits suicide, the misplaced love finally collapses on the snowy night in Yue Kingdom, and condenses into the drop of blood on the hairpin that will never dry up.
