Review Detail of MissyLib in Why Did I Become the Villainess?

I recently bought a comic called “Villains are Destined to Die” created by Suol (original story by Gwon Gyeoeul). The thumbnail you used for this story is using the main character from that. Nowhere in your description do you use any of the characters from that book or give credit for using someone else’s artwork. Care to explain?