Help me find this manga please!

So.. I know the plot a bit and even what the main dude looked like but I really cant remember the name.

It is a manga, about this serial killer killing people without ever even touching them, he kills them by using placebo's. The MC dude is the killer who usually wears red and/or a black suit with a red tie. There's someone who has been trying to catch him, I'm not sure if it's a dude bcs my mind is saying it's a police woman but also not? I think it has an live adaptation where the one who's chasing him is a girl but in the manga it's a guy. Not sure. But he's a killer who uses placebo's to kill.

I've been trying to find it for a while now but whenever I search up placebo killer, that damned bl manwha keeps showing up..