Since we don't have the actual story of Franco and Nam, we can only speculate. They could be people from different cultures coming together in a story of cultural exchange. Or they could be rivals in a competition - based story. Maybe they are neighbors with an interesting story of how they interact and get along or have conflicts. However, this is all just speculation without the real story.
It varies. There are different levels of privacy when it comes to geo - tagged photos. Some social media sites give you the option to make your entire profile public, in which case strangers can see all your geo - tagged photos. However, if you go into the privacy settings and limit it to a smaller group, such as only people who are mutual friends, then strangers will be excluded. Also, some platforms may have a 'nearby' feature where people in the vicinity can see your geo - tagged photos even if they're not your friends, but this can usually be turned off in the settings as well.
Since I don't know the 'Bae Jung Nam story', it's hard to say exactly who Bae Jung Nam is. He or she could be an ordinary person with an extraordinary story, or someone well - known within a certain group or area.
There are many interesting fanfictions about Geo from Megaman Star Force. Some might focus on his adventures beyond what's shown in the game, like his encounters with new types of EM viruses. Writers often explore his character development, showing how he grows from a regular school kid to a powerful hero.
I'm sorry, but I don't know the specific story of Franco and Nam. There could be many different stories about two people named Franco and Nam. It could be a story of friendship, adventure, or something else entirely.
One more thing to consider is that there may be some interference from other apps on your device. Some apps may conflict with Snapchat's functionality. Try closing all other background apps and then attempt to add to Geo Stories again. If this works, then you can try opening the other apps one by one to figure out which one was causing the interference. If none of these solutions work, it might be a more complex software issue within Snapchat that only the developers can fully address, so reaching out to their support is a good next step.