Sovereign and Heartburn

Aria's world is thrown into chaos when Crown Prince Julius, the brilliant but insufferable royal she's sworn to protect as Captain of his Guard, announces her as his future bride. Stunned, Aria confronts him, and Julius offers a way out: if she can defeat him in any competition before the wedding in six months, he'll cancel the engagement. But with Julius' unmatched skills, winning won't be easy. Can Aria outsmart the talented prince and reclaim her life? Read Sovereign and Heartburn / 君主様に胸やけ / 주군, 속이 쓰립니다
The main character, Aria, is a career woman who serves as the captain of the prince’s guard at a young age in the Rosenberg Empire. Her lord, Prince Julius, not only possesses immense wealth and power but also has a stunning appearance that everyone can’t help but acknowledge. Unfortunately, his personality is a total disaster. Aria is fed up with being tossed around by him every day. But surprisingly, Julius might just want to be with Aria…?? It’s the divine-looking prince versus the overworked female knight, and a precious master-servant bickering couple is born!