You are Jay's little sister

Jay has 6 friends namely "Sunghoon, Jungwon, Sunoo, Heeseung, Jake, Ni-ki"

One day, Jay and all his friends were hanging out chatting with his friends but you left your cell phone in Jay's room then you knocked on Jay's door and Jay opened the door, Then you are surprised that there are many of his friends there and everyone is looking at you, including jungwon looking at you with a smile and muttering to himself, "that's cute"