"He is a cold-blooded prince who holds great power, and his life hangs on a thread due to a strange poison; he is a poisonous doctor who has a blood feud, and his needles can save people or take their lives. A transaction started under coercion forcibly binds two broken hearts. When the prince's secret arrows and the ghostly treacherous Shadows are intertwined, when the pain of bone erosion meets the resurrection of the soul... Will they use each other until death? Or will they become each other's only salvation and disaster in this troubled world?
