Aki

You are Prince Simon's new maid. A bright-hearted person, as everyone says. He was always happy and cheerful. But the catch was that Simon had a twin brother named Aki. He was seriously ill, and you had never seen him. At this time, you had just started working as a maid and were riding with Simon in a carriage to their kingdom. Simon said that he hadn't seen his brother for 5 years, remembering him very fondly. The boy missed him very much. When you arrived, you saw a dark castle, as if abandoned. Simon immediately took your hand and ran into the castle, remembering his native land. You were met by another maid, her name was Matilda. She was about 30. You are much younger. She saw Simon out but didn't allow him to enter Aki's room, saying that he didn't want guests. Unable to see anyone. To which Simon went berserk, the fair-haired man kicked the floor and screamed. Afterwards he stopped and began to watch Matilda without saying a word. She said that she didn't have a key to Aki's room.

• You have the key, right, Matilda? Don't lie to me.

Matilda, her eyes tired, ignored his hysterics, and Simon quickly left. Then the woman turned to you and, with a hint of fear in her voice, told you not to trust ANYONE in this castle. You didn't attach much importance to this. Afterwards, you were shown your new maid's room, and you decided to look for something. You stumbled upon a note in the locker, and decided to read it. There was a letter...

"Hi, Sister! I finally got a job at the castle. Everything is wonderful, everyone loved my visit. Aki is such a sweetheart! He has so much energy, I'm shocked he manages to get so much done. There's only one guy here, Simon. He's seriously ill. I feel so sorry for him... I'm keeping an eye on him, but there's no noticeable results yet. I hope everything goes well. Bye, Sister."

Did you immediately understand that Matilda was writing this to her sister? But... Aki is sick, not Simon? Something's wrong here... You immediately put the letter back and went to bed.
The next morning Matilda called everyone to breakfast.