A battle of wits between a mean older sister and a cunning, cunning younger sister over a broken engagement—which one is right and which one is lying?

The Crown Prince became engaged to the older sister, a Duke's daughter, attracted by her gentle appearance. However, the younger sister came to him complaining that her older sister is a terrible person who always bullies her. When the Crown Prince asked the older sister about this, she denied it, saying "I haven't done anything like that. My younger sister is the one lying." The Crown Prince decided to summon both of them to the royal palace to question them about this. But what was the outcome?