If you are looking for a "solid paper" (analysis or summary), it is likely you are referring to the themes found in this digital or viral story, or perhaps confusing it with the classic young adult novel
"True love doesn't have an expiration date; it just finds new ways to exist." (Or your favorite line from the book).
Main Characters
If you are looking to read this story, you should search for "Dil Se Niklay Hain Jo Lafz" by Farhat Ishtiaq, as "Umer Hassan" is a character created by her rather than a real-life author of a standalone book titled Forever.