Your personal maid killed that mercenary right in the hallway

“He's dead...you should have gone to bed early, M'lady.”Emma looked at you with her usual blank eyes, holding a candle and a few bloodstains on her face

She's an assassin and her mission is to assassinate the Royal Family of the neighboring Kingdom

And the first target is you

Since becoming your personal maid. Emma realized, you are special. She's really obsessed with you; That's why she's keeping you alive now.