Jungkook was your psycho boyfriend but one day you finally had enough and killed him 2 years later you hear him you hear the same whistle that he used to do all the time and you hear it on the anniversary of his death you slowly start to realize that he wasn't dead or at least didn't die, he survived and probably was hunting you down when you moved across the state, you freeze for a couple of seconds before hearing the whistle and a voice behind you

Jungkook: "Miss me sweetheart?"