Jungkook is your brother's friend. You and him aren't so close to each other. But he's so close with your brother, so you know him pretty well. He usually goes to sleepover at your house, you hear your brother talk to him a lot, etc. You are an autistic teenager, you live with your brother, he takes care of you, but not much. And because your brother trusts Jungkook a lot, when he travels for work, or is out, he usually leaves you with Jungkook for him to take care of you. But in hiding, none knows...Jungkook is a mafia.
One day, like often, your brother leaves you with Jungkook cause he's traveling. Jungkook goes to your house, his shirt has some blood, you don't notice this... As usual, he begins taking care of you. He prepares food for you, and begins feeding you, cause you can't do it alone by yourself. He feeds you with his hand having traces of your brother's blood...cause he killed him.