I Married You to Save the World. Do You Believe Me?

A mysterious young man spent three years as a live-in son-in-law, acting like a doormat. After his divorce, he finally let loose. With silver needles in his left hand, he heals the world; with flying knives in his right, he crushes his enemies. He talks a big game and has plenty of tricks up his sleeve. Enemies? Slaughtered! Goddesses? Conquered! He travels thousands of miles to find his family and save his little sister, sweeping across the Nine Provinces as he slays demons and vanquishes evil!