She was the top assassin of "Youhuo", but her plane exploded while training newbies, and she accidentally entered the Tang Dynasty and met him;
He was the master of the "Night Palace", but he was killed by her when he was being chased by his enemies. From then on, his heart beat only for her.
They thought they had a connection, but she disappeared again, just as mysteriously as she came.
When she reappeared, she became "him". "He" hated his betrayal, and he also had troubles. What happened to this relationship...
More.. (Trembling) updated (crying)