Anyone recommend me your top 1 scariest manhwa or manga bec want to challenge myself rn si...

I'm not sure if it was Shriek or Unknown caller, but if you read it from the Webtoon app, u'd even get a call from the ghost and the ghosts are in motion.
Try it

This one? https://www.webtoons.com/en/thriller/shriek/list?title_no=772

Sweet home is gooood

Yes, but m not sure if you get the phone call from one of those stories. Try "unknown caller"

http://www.mangago.zone/home/mangalist/1090462/