Response: 19Th Floor of the Old Building

The "old Anseong building" where the protagonist lives does not have a 19th floor, but people continue to disappear or die due to "accidentally entering the 19th floor". Every time you approach the 19th floor, you awaken the "tampered memory", and the 19th floor itself is a time and space vortex that swallows "obsession". What is the essence of the 19th floor? What is the protagonist's "obsession"? Can you finally escape?