I thought she already knew that
same, but now that I look back at it she knew him as the guy from her past life who also got reincarnated rather than the grown man who wants to marry her, she didn't even know the guy who proposed to her face' plus he didn't tell her his name from that life so of course she didn't know. haha lol~
Now that i think about it, youre right
He must be really happy, even in reality