Okay so a little spoiler about this lady Kate who appeared in the last part of the chapter
Spoiler!
Actually she's the real Lianca the only legitimate daughter of Duke Snowhitle. The current Lianca was her half sister who killed the whole household by putting whole mansion on fire and took her identity after making contract with a demon Michele the butler. Real Lianca changed her name to Kate and had been hiding ever since.
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule you will find me in most romantic historical manhwa comment sections
