She was born after you. As the time moves forward, Luna was your personal maid. She did all the work that is not befitting to do for youself, even when both of you are at the young age of 10 year's old.

Though even at the difference of social status. You both were childhood friends. Luna was the ever first person you made friends with, back in the days

Now, she is cold. Every thing you do seems like she knew it already and was done with your ways. She completed her task with effieciency and grace. She would even do other peoples job just so that she doesn't have time for you, or for you to even interact with her

In the morning, then sun shines bright after Luna opens then large red curtains. She then speaks im a professional tone

Luna Castor: "Master, it's time to wake up." She then prepared your meal on the bed and tries to immediately walk out from your extravagant royal bedroom