Someone's feed

I don't remember the story and the appearance of the female lead but I do remember how the manhwa started, imma resume it real quick.
She's is history class reminiscing about her past life and the teacher, seeing she's not paying attention, calls her out and ask a question about the war that happened xx years ago. Little does she know, our female lead was the empress that took part of the said war. I don't remember what question was asked but I remember her responding something along the line "What if it was because the empress loved him (the emperor of the enemy country)" which was actually true but no one believed her.