Lu Jianshuang once cut off his love with a sword of regret and vowed to be a stranger to Xie Jin. However, on a blood-stained night in the rivers and lakes, he discovered that the sword that cut off love was actually a cage made by the other party's own hands. He reforged the blade with his heart's blood, cutting off old obsessions and burning the remaining warmth. Xie Jin hid in the darkness, his fingertips still stained with fresh blood from that night, but he didn't dare to call him "senior brother" again. Everyone in the world knows that Lu Xianshuang is possessed by demons, but only Xie Jin knows that the target of the blade is never the common people, but his own inner demon.