The Best Remedy for the North Wind / Gut Gegen Nordwind

The love story of Emmy and Leo is a touching, amusing, witty, and incredibly captivating internet romance in letters. Emma, wishing to unsubscribe from a persistent mailing list, mistakenly sends a letter to a private address. Thus, a correspondence begins... between two strangers.
We all communicate online in one way or another, and very often our interlocutors are invisible people we have never met in person. In such communication, there is an appealing ease with which one can reply to a person who does not see you and whom you do not see.
The relationships of the characters evolve in virtual space, but this is not important at all, as their experiences are real. Can correspondence lead to something serious and genuine? Or is it merely "a remedy for the north wind"?