Who Ordered Death to Unit 502?

"At 10:00 pm sharp, a food deliveryman wearing a cap knocks on the door of Unit 502."Excuse me, are you the one who ordered delivery?"Unit 502 is an apartment that's rented out to multiple people. There are three rooms here altogether.The one opening the door is my roommate, William Yates. He has his headphones on and is currently immersed in a game. So, he waves a hand impatiently."It wasn't me."The deliveryman wastes no time in pulling out a machete. Immediately, he slashes William's throat in one fluid motion.Next, the deliveryman opens the door leading to another bedroom while holding the takeout."Did you order delivery?"That room belongs to a gym trainer named Leon Holton. He's obviously taken aback by the deliveryman's presence."Nope. Who are—"The deliveryman doesn't give Leon a chance to finish his question. He reacts by plunging the machete into Leon's heart.When I'm done with my shower, I open the bathroom door to see large puddles of blood on the floor as well as the deliveryman, who's wielding a machete."They weren't the ones who ordered delivery. Did you do it?"Scared out of my wits, I subconsciously shake my head. "It's not me! I don't know anything—"Before I can finish speaking, the deliveryman hacks me to death.When I open my eyes again, I've gone back five minutes in time before I get murdered in cold blood.Almost immediately, I rush out of the bathroom, only to see the alarmed expressions plastered all over William's and Leon's faces.That's when I'm certain that everyone has gotten reborn.Suddenly, the doorbell rings loudly.A suppressed masculine voice echoes afterward. "Excuse me, are you the one who ordered delivery?""