Mansion lake

Getting into the lake behind the mansion:
To get into the lake you need to first complete Quest 6: The Mysterious Virus and also own or buy the mansion, next you need to wait for the weather to get unbearably hot / warm, this can be achieved by sleeping in the mansion bed, next once Xora mentions the lake go back to Mundae and go to the top right house and talk to the man inside, he will explain how he got to the lake behind the mansion, simply return to the mansion and go up to the locked gate, interact with it, then talk to the broker and purchase the lake [40,000 cum bottles] then simply go back up to the gate behind the mansion and unlock it.