"Secret Love: The Schoolboy and the Mailwoman" tackles several themes that resonate with audiences, including:
The 2005 film you are looking for is a German romantic drama titled Secret Love: The Schoolboy and the Mailwoman (Original title: Heimliche Liebe - Der Schüler und die Postbotin
Here is a deep dive into why this 2005 title captures a specific kind of cinematic magic.