Hm, so the female lead did not age during those ten years? That would make the differences of their age & mental maturity 10 years huh. That's a lot, considering the heroine will only meet 'strangers' now who are completely different from "yesterday" to her.
Why the hell does the second female lead immediately think that the heroine is from ten years ago? Makes no sense, it was dark and time slips are honestly really unbelievable.... So a seemingly succesful woman like her shouldn't immediately come to the conclusion that this is her fiance's first love who did not change at all in 10 years