Before I Transformed, I Was Actually a Female Demon Lord

I used to be an ordinary female student. After my scumbag boyfriend dumped me, I was hit by a car and died.

Then I transmigrated into the body of a peerlessly beautiful female demon and was hunted by a group of people. I lost my memory and changed sex.

After changing sex, all I wanted was to be an ordinary man, marry a wife, have a warm bed, and get on with my cultivation.

But...

My best buddy seems to be my ex-boyfriend????? That damn scumbag?!!!