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Originally Posted by Erick Estrada

Or the servant may make an appearance in a future episode with a bastard child or something. The entire scene involving the conversation, money, and tea seems to be foreshadowing that this may not be the last we see of this girl.

Spoiler from the trailer

Spoiler!

They show a bastard son. I'm guessing this is the offspring of the servant girl. No way they would make that much effort to show what was going on, without it playing a role later.