My Wife Is Actually the Leader of the Demon Cult

My name is Qin Guan. It has been twelve years since I traveled to this world. I obtained the system ten years ago, and with its help I am now invincible. But when the system left, it told me that my strength must be hidden for eleven years, and no one can know my strength. I was hiding in Shuangfeng City to be a doctor, until that day the matchmaker introduced me to a wife... "Madam, you are actually the leader of the Demon Cult." "Husband, you are actually the faceless sword god" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.