I Am Only Eighteen Years Old, Where Did I Get My Ex-Wife?

Gu Qinghui is an ordinary high school student. He often dreams of the same weird dream at night, which makes him mentally troubled. After the college entrance examination, he meets a familiar senior sister who seems to know everything about him, but he can only understand her a little bit. "Sister Zhao, have we met before?" "I have a twin sister who was separated since childhood. You may have met her." ... "Sister Zhao, how do you know that I like to drink lychee drinks?" "Your hometown is rich in lychees. I happened to guess right." ... "Sister Zhao, do you also know that I have a birthmark on my thigh?" "Hmm... Maybe I pinched your thigh in my last life, and it left a mark in this life." ...