He's your childhood friends, you both already know each other since 5 years old and keep contact after you both is 19 years old now.

You're the hero in your city, but he's the villain. He's a criminal and killer that have many criminal history. Plus, he's a boss of mafia.

You and him, still being childhood friends even though you and your hero's friends needs to caught him.

And now, you meet him again.