A princess of one nation uses her own charms to bewitch the ruler of an enemy kingdom and its crown prince. At first, she plans to start with the crown prince. Gradually, she succeeds in making him fall in love with her, but she also loses herself in their false romance and falls in love with him. She knows how tainted she is and how many people have used her, and she remembers promising her younger brother that she would help him destroy the enemy kingdom... A year later, on her twentieth birthday, she bathes the enemy kingdom in blood. Her half-brother arrives in An Kingdom that same year. That day is the moment he has spent years carefully waiting for: the unification of the three kingdoms.
The guileless crown prince: “Why does the Crown Princess keep staring at me?”
His enticing Crown Princess: “Because... Your Highness has such a handsome face that I... am quite captivated.”
“Earlier, in the hall, I asked my husband something, but you still haven’t answered me.”
The Crown Prince: “...”
A bit rough around the edges, with an ordinary plot