P.S. I Like You discussion

Hi. I was trying to find a book similar to this. Not necessarily the whole 'writing letters to strangers' bit... but more like, two leads that have that kind of banter and bickering relationship from hating each other or misunderstanding each other... until it turns into something else.

But I'm also not really interested in smutty romance novels, but just a nice romance... similar to P.S. I Like You.

Thanks.