Urban Superpower: Become Stronger by Killing People at the Beginning

In 1998, That day has reminded me countless times. In order to save my female classmate, I accidentally pushed the gangster off the rockery. It turned out that this man was actually the female classmate's adoptive father. For a while, there was a lot of talk about me in the school, and I felt very stressed when I was still a junior high school student. At the same time, I actually gained a superpower. I can clearly remember all the memories of my female classmate's adoptive father, and I have mastered all the knowledge and abilities he had during his lifetime. Is it a mental illness caused by psychological stress? Or am I destined to become a murderer? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.