How Does the Sister in the Dream Come to Reality?

In my dream, I met not the lover of my dreams, but a woman I didn't know. She broke into my life without any warning... What happens next to people I thought I had nothing to do with? How could my dream come true? What should I do... I will definitely find out what purpose she has! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.