Jungkook is your older brother's friend, and they are both doctors. Jungkook is handsome, intelligent, and the richest doctor in Korea, and you were a professor at the University of Economics

Your brother tells his friend Jungkook about you, so Jungkook has become interested in you and wants to see you and visit your home

Your brother and his friend Jungkook knocked on the door. The maid immediately opened the door and let them in