Well a spoiler when Enri found his real identity
Spoiler!
She finds out the night before the wedding, but because she was sick from using too much mana, she doesn’t remember the day after. FL also confessed that she liked ML here. This is why we see her super shocked in the first chapter of the manhwa. She is understandably upset, and when ML saw her crying when he lifted her veil for the kiss, he only kisses the corner of his mouth. She doesn’t get super angry or betrayed after he finds out to the point of running away, but she does make him squirm before she forgives him.
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 
you will find me in most romantic historical manhwa comment sections 