Guys i found something out.
When John_Dev says in the game you should leave, leave. Then directly join again and capture the flage until 3 times again. Then you got freezed by Johns wife at the water. Turn around and let jumpscare. When the chat writes : "John_Dev joined the game", search for an eye at the sky. then shoot it. After that a guy writes up, up, up, down, down, enter. You iwll be back at the server screen. Type that code and look at your desktop without closing the game. look at the file. there is another code called "25467". Go back to the game type "haunt" and the code. There must be a scream. When the scream stopped press esc, join a server and fall into the water. If you did everything right, you landed into a room with a pc. Go to the PC, enter with shooting at the keys: "191421". The code removes the glass to the white flag. Touch it and you are already at the end. What happens after i dont want to spoil.