Responses
https://www.mangago.zone/read-manga/emperor_and_the_female_knight/
This would be my guess. Even if it isn't the right one, I highly recommend reading it anyways. It's incredibly sweet and a great read.
I remember a panel where dude (noble) is getting down on his knees and giving a bouquet of flowers to a lady(I think was a knight) who is sitting on a bench. I don't know if he said but I know it was a confession