Searching for a manhwa!!

As fas as I can remember the setting for the manhwa was in artificial space (but we find out at the end). The MC is with amnesia and is locked inside his house that is surrounded by snow on some mountain I think. His lover was acting like a butler? But he was very suspicious. All of the stff had their memories altered every few days. Qt the end we find out that everyone and everything is a lie. MC wakes up and is followed by MC's lover and they had some deep talk about this (I think??? And I think this was set like in the future???)