Storyline- MC cannot learn martial arts due to defect in mortal root. He saves a female person and she stays at Mc place. She is actually from Butterfly Demon Emperor from Eastern Wilderness and after seeing determination of MC she teaches her martial posture of different demon to cultivate and change his destiny. Later on she has to go back to her realm, but our MC cultivate and becomes strong to pursue her. The female lead also gives her a beast companion as a partner to her. Can someone help me out with the name of this light novel ???