It's been a long time since I read the manhwa but I just noticed this: We never knew what happened to the duchess's face. I mean, that's a pretty important plot line. That's why she was wearing the mask in the first place. The plot never explored this any further and the only explanation we know is that she was betrayed by someone.
The ending felt anticlimatic in my opinion. I just expected a bit more to happen :/ I also think it's sad that Giseong doesn't want to work as a teacher anymore after everything she went through.
It's been a long time since I read the manhwa but I just noticed this: We never knew what happened to the duchess's face. I mean, that's a pretty important plot line. That's why she was wearing the mask in the first place. The plot never explored this any further and the only explanation we know is that she was betrayed by someone.