Unforgettable (Jungkook FF)

For your information:
This was the first story I wrote and I'm cringing a bit myself while reading this. Yet I won't take it down because it was the start of my writing journey. So have fun with this awkward mess xD

Seoul is a big city. And in big cities there are always gangsters. Those gangsters are stopped by agents. The most known agency is Bulletproof, and their top agents are none other than Jungkook and Hyejin. They've known each other since they can think. They are a team as agents, and since they live a double life, they always help each other balance it all out. They are unstoppable. And since more than 3 years, they have dated already. Hyejin has lost her family at a very young age, and since then, the only people she had were Jungkook and their team.
But what if one mission went wrong? What if they got into an accident one time.
After one of their missions ended in an explosion, they were brought to a hospital. Both were injured pretty badly, but to Hyejins shock, things went the worst way for her.
Jungkook lost his memory and a girl in her class in high school shows up. She has to fight for her love. But her life is getting harder and more difficult. How will she behave? What actions will she take?