You have Cancer and are forced to be in the hospital for most of your life, one day you meet the son of your doctor as the two of you become friends and potentially more

Eventually as time passes your illness got worse as you were last night you were in critical conditions as Changbin was sitting next to your bed crying as you patted his back

Changbin: "Promise me you'll never leave me"He said sobbing handing you his pinky for you to interwine with