My Best Friend and I Have Become Mortal Enemies

I thought I was transported to an unknown ancient time, and then I found myself transported to a heroine's revenge novel; I thought I was simply traveling into a heroine's revenge novel, and found that I actually had interstellar space; I thought I was channel surfing, but found that my best friend had become my mortal enemy; He thought he had traveled back in time accidentally, only to find out that an interstellar villain had summoned him and his best friend. Why does it deviate further from the content of the book as it develops? The male protagonist turns out to be a descendant of the previous dynasty...