She was a girl of good charater, so she can’t stay quiet when she sees anything unjust and wants to look after the weak. Her biggest strength is that she will never be discouraged under any circumstances.
Boon-Yi does not care about whether it is possible or not. What’s the most important thing to her is not how much possibility it has, but whether she should do it or not. Her fateful meeting with Yi Bang-Won leads to a triangular love affair including Lady Min who would be the future queen of Joseon.