MC got transmigrated to a horror game as a maid. Technically in the game the young master (ML) kills people in the mansion. MC have system, that's not very supportive anyway, at least she got some useful skills though. MC is quite unlucky (?) or the system is just terrible, anyway life is tough for her. ML said he fell in love with MC. (Dunno if that's true but anyway)
How to Survive as a Maid in a Horror Game