I'll help the Demon King settle the world

Introduction:? ? ? I'm just lazy, uneducated and incompetent, so I have to be treated as a "strict teacher" male lead by the author. Is it so sad for me to be a female lead? Although this male protagonist is indeed extremely handsome and generous, he not only gave me the silver dragon ring, a golden finger that can create "18 kinds of weapons", but also taught me how to defeat six generals through three levels and level up. Fight monsters successfully all the way and become the world-famous "Female Swordsman"! ! ! I'm awesome, I'm so awesome. This kind of "picking up the slack" has happened to me. I thought he would always support me behind her, but when his true identity as the "Big Devil" was exposed to the world, it was also him