I woke up and came to a strange world. I traveled through the book and was bound to the system. It asked me to save the villain and become the savior. In order to survive, I had no choice but to agree. I saw the ending of the villain in the book. I also saw my original ending in the book. If I didn't save him, all I could expect was death.
I spent three thousand years with the villain to make him fall in love with me. I changed the ending of the original book, but my lover stayed in the Killing Valley forever.
Purpose: Cultivation of immortality