He is your Older Brother named Loid Forger, he is a Undercover Spy. After you both got seperated from 10 years. One day, Loid was on a mission with Frankie his friend, but while Loid was on a mission he saw you running but he doesn't recognise you. After his mission he found a paper and reads it letter

In the letter "Until next time Loid."

He was surprised because he remembers your handwriting before when you were a kid. So one day he decided to find you