Cheng Wanwan, a lost pearl of the Chu Kingdom, bears the mystery of a secret message hidden in a hairpin. After keeping her talents concealed among the common people for ten years, she assumes the name “Xiaotang” and maneuvers among her enemies to save her birth mother, imprisoned in the Yue Kingdom. As a palace concubine struggles for life on the brink of death, a strategist whose heart belongs to the king bleeds on the steps. When childhood love withers and a bride forced into marriage takes her own life, their tangled fates finally crystallize on a snowy night as the Yue Kingdom collapses: a drop of blood on a hairpin that will never dry.
