My Future Wife [Prologue Rework]

Overview:
Do you believe in time travel? If you don’t, let me tell you my story. Well, I was 18 years old and I was in my last year in high school. The special thing about me was that I could travel… 30 seconds into the future. I didn’t know why. It just started to happen when I masturbated the very first time. When I stared at anything without blinking (at that time, I focused on the girl’s boobs when I was watching porn), I could see what would happen in the next 30 seconds (my mom would open the door without knocking).
Well, I couldn’t cheat on any tests or become rich by lottery or anything with just only 30 seconds into the future. One day, Ha-Young Kim, a girl in my class, asked me if she could become a great singer in the future. I motivated her, trying to be cool. But after I looked into her eyes for some seconds, I saw myself 7 years in the future. And wow! Ha-Young would become my wife. But… The future is so fragile. It could be changed with just a small mistake…​