Just finished this and I was left confused.
They legit kiss as strangers, and then the next day they are in love and dating like they've known each other for decades.
If the romance had any realistic progression whatsoever, it would be very normal for the main couple to share such an intense love for one another..but no.

Just a heads up, there is a 16-year age gap between the ML and FL. Although, that didn't bother me since they were both adults.

I guess my advice would be: If you want to watch this, don't try to make sense of what is happening.