Definitely. 500 Days of Summer depicts the complex and evolving nature of love between the main characters. It shows the hopes, dreams, and disappointments that often come with a love story.
Love could exist in ordinary days. In novels or TV dramas, sometimes the characters would meet each other in the process of transmigrating and develop a sincere love story. This is not necessarily the case because every story has a different plot, but such plots are often loved by readers.
Since we don't know the specific '14 days love story', the main characters could be diverse. It might be a couple from different backgrounds, like one is from a rich family and the other from a poor one. They could be named something simple like Jack and Rose, or they could have more unique names. The important thing is that they are the ones whose love story unfolds over the 14 days.
As a person who loves reading novels, I didn't know about the application that recorded the number of days of love. But usually, the application that recorded the number of days they loved each other would record the time they loved each other as a project or record it. These applications can calculate the number of days in love by measuring the time between two people or recording the moments when two people are together. Some of the popular applications include "Days of Love" or "How Long Have We Been in Love", which can be found in the mobile app store.