Reason why a magical pharmacist loves the second disciple

Liliana was in despair. The secret surrounding her life was exposed by the high-class aristocrat, Brail. Summoned to the royal castle, she was waiting for her sentence to be either the death penalty or dissection when... she was told, "Number 2, starting today, you're in charge of meals." Wait, what?! (Source: Kadokawa, translated)