Typically, if Y/N gets hurt in this scenario, it might lead to a series of events that revolve around Y/N's recovery. Jungkook might feel guilty and try his best to make it up to Y/N. The other BTS members would also step in to help. For example, Jin might cook special meals for Y/N to help them regain strength. J - Hope could cheer Y/N up with his positive energy. And this event could be written in a way that it cements Y/N's place in the BTS family within the fanfic world.
The story could progress with Y/N in the hospital. Jungkook would visit often, with a sad look on his face. The other members might take turns to look after Y/N. As Y/N recovers, there could be flashbacks to the incident that show how important it was to save Jungkook. This could lead to a stronger connection between Y/N and all the members, especially Jungkook. And the story might then shift to how Y/N becomes an important part of BTS's journey, with their relationship being a central theme.
Honestly, 'y f n' in fanfic could be a random combination of letters without a widely recognized meaning. Maybe it's a made-up term by the author for a special plot element or character trait.
I'm not entirely sure specifically what that particular 'bts y n is a hybrid hurt fanfiction' is about without more context. It could be a fan - created story that involves the BTS members, some kind of 'y n' (which might be a made - up or specific character in the fanfic world), and it's a 'hybrid' concept which could mean a mix of different elements like human and something else, perhaps supernatural, and 'hurt' might imply there are elements of pain or emotional distress in the story.
It can change the whole mood of the story. If Y N gets hurt, it might introduce a sense of urgency and concern into what was previously a happy and exciting concert - going experience.
Perhaps Y N's injury is not too serious at first, but it starts to get worse as the concert goes on. In the fanfiction, this could lead to a very emotional moment where Y N is taken backstage and the EXO members visit them to offer their support and concern. It might even start a friendship or a special connection between Y N and the group.
Obviously, YN and the members of BTS are the main characters. YN is the one who has the accident of falling at the concert, and BTS are the ones who are performing and then get involved in the situation because of YN's fall.