The Guilty Savior System My Enemy Savior

A couple's breakup triggers a series of events around the girl who is saved by a person who hates her the most

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When I opened my eyes I was greeted with chaos. The sound of sirens ringed in my ears and my eyes half opened barely able to see anything. I felt a lot of dust on my hands and the smell of cement filled my nostrils followed by a metallic smell. I sat straight on the floor and rub my eyes with my fingers to clear my vision. I took a look around. Many policemen around sealing the area with the yellow tape guiding the people around to not pass the boundary.

Why am I in this abandoned building? What happened last night-

ARGH!!!

My head was throbbing in intense pain as if the nerves of my brain are tied together and are being squeezed and twisted with extreme force preventing me to recall my memories. I cupped my head with both my hands in an attempt to stop the unbearable pain. When I diverted my mind to think something else, the pain gradually left my body.

I am pretty sure I headed straight home after meeting Jin. Was I caught in an accident?
I scanned my body, rubbed my arms, shoulder abdomen in search of any blood, injuries, or broken bones. But I was unharmed, perfectly fine just had dirtied my clothes. I let out a sigh of relief.
Wait- then why all those police around here sealing the area as if someone was murdered.