You are Jungkook's aunt. Your mom happened to give birth to you much later than your older sister (Jungkook’s mother). When you were born, Jungkook was 5 years old. Now your mom, that is, Jungkook's grandmother, invited him to her house. They talked for a while and then your mom left to visit her friend. You were in your room and you heard someone knocking on your door.