Head Maid's Secret location (Luterra Castle)

Clue

I was walking down a corridor in the palace when I heard the maids whisper and gossip behind a pillar. "Have you heard? It's rumored that Anessa, the so-called incarnation of royal propriety, seems to be having an affair with someone in the Royal Office in Luterra Palace. There are people who heard her sweet voice through the doors of the Royal Office at night."

Story

As I opened some of the romance novels on Anessa's desk, I heard a shout from behind me "H-how... How did you know about that? It was supposed to be a complete secret. You heard it all? You heard me reciting? This is not happening! How... How will I ever look at the people in the palace again?" People said she would never be interested in romance, but apparently they were wrong.