I Fell for a Disguised Crown Prince

The beggar who gets her face back for her is the crown prince, and he lets her go on thinking he is a beggar. She is a concubine's daughter with scarring across her face, handed to a disabled man in a marriage meant for her half-sister. She puts her name down for the crown princess selection to get out of it. The beggar treats the poison in her, the scars clear, and she comes first in the trials. When she learns who he is she calls the match off. He does not accept that and keeps after her. The Grand Preceptor turns out to be her real father, and the case that ruined her family goes back decades.