The Needle of Gui Men

It was said that the ancient medical technique, the Needle of Gui Men, was miraculous. The good could use it to bring the dying back to life, and the evil could use it to manipulate people as puppets. Everyone coveted it. However, it has disappeared early in history, and no one could find a trace of it. Just as the stories of it have almost faded away from the memories of the people, a serial murder case arises, involving the Needle of Gui Men.
Song Jing Zhi, originally named Wu Jie, was a disciple of the Gui Men sect but was kicked out after being blamed for killing his master. Years later, he gets involved in the serial murder case involving the Needle of Gui Men technique.