Help Help Who is netflix profi?

I'm looking for a series that I recently started, unfortunately I can't find them anymore. It's about a couple of teenagers going into the forest and suddenly going out to a dark-haired girl and killing them. After a few years, they come back to the place where they have hidden them behind a stone, but there they can't be found. Now they have total panic that someone would find out. Then I can still remember a place where a man in the mountains is in a sauna and was chafed by a chainsaw… I do not know if the series is new or old. Can someone give me a name?

Pretty Little Liars?

No.