Find that Manhwa

The fml and her brother borth have silver hair. In this world (fantasy kingdom setting) select individuals have abilities. Fml's brother, ml, antagonist pope, and a Duchess and her son have such abilities. The Duchess who was like a mother to the fml, hid her scarred face with a mask and almost died after having an outburst with her ability, however the fml was able to save her because she is able to calm the outbursts of empowered individuals.