I think this was a korean historical novel. The FL was sent to the past by the ML when the church they were staying in got bombed. FL remembered everything but the ML did not. The ML was a duke i think who invented something that cause the great war. Before she went back to the past, the ML was blind. He turned blind due to the curse of his mother, because his father cheated on his mother who is a fairy (?). When she got back to the past, she married the ML to get away from her family, but she didn't knew he was her lover. The ML got jealous of his future previous self because he thought she was in love with another person. The ML also got a curse where he can't stand in the morning. This is like an itch I can't scratch. Please help. Thank you.