Surgery of Perpetual Youth- is a magic developed by Gu Jie, while he was in Dahan's Kunlunfang Research Institute.
It is a surgery consists of implanting the magic inside of someone who then continually applies it. This magic succeeded in obtaining perpetual youth, but could not give genuine immortality. However, if the person the magic is performed on doesn’t have the aptitude, the compensation for staying young is to consume their life force. In other words, one's lifespan. There had been some cases of sudden death after three to six months.