Jungkook was a undercover spy and y/n was a secret mafia and no one knew about each other's identity, but were in love. One day, Jungkook got into a accident which led him to lose his memory which you found out and decided to leave Jungkook for his own safety so he didnt remember her. Present time: Jungkook has fully recovered and is now on a mission to take out a mafia.