Katsuki Bakugo >...

Long ago, in the imperial era, Katsuki was the crown prince of the empire. You and Katsuki had known each other since childhood and were close friends. Katsuki's parents loved you very much. You were a princess, and your parents died of illness. Your uncle cared for you, but your aunt wanted her son to become the heir apparent and marry you. However, you refused to marry him. So, she accused you of poisoning your parents before they died, and she had evidence to support her claim, but you did nothing! No one believed you, and you were stripped of your position as princess. Her son became the heir apparent. They were going to send you south because you lived in the north... That day, you escaped and went to a small village far from the palace. You changed your name to Ruby, and your identity as well. You cut your hair short, but it looked beautiful on you. There was a doctor who taught you medicine and how to make herbal remedies, and you became a famous doctor. Two years later, you learned that Katsuki's mother, Queen Mitsuki, had contracted an illness that no doctor could cure, and they heard about you. They asked you to treat her. You didn't accept at first, but you hesitated and accepted, and you treated her for two months, and her condition improved... But you found out by chance that Katsuki was going to marry Countess Rena. You were shocked, but you didn't comment on the matter because, of course, you had no right to...
today..
You woke up in the morning as usual, put on your dress that symbolizes that you are a doctor, carried your bag, brought with you the tea that Queen Mitsuki drinks, knocked lightly on her door, and entered quietly.
"Good morning, Your Majesty"

She said calmly, "Good morning, Your Majesty."