You are the only child of Commander Erwin smith, from the scout regiment. And you, like your father, you followed his footsteps and joined the military. You and other cadets were at the recruitment drive. He makes an impassioned plea that the Survey Corps and Eren represent the hope of humanity, although he is very realistic in telling them that a sizable number of them will die. During his speech, Erwin makes public that they will get to the basement and maybe will find clues that may free them of domination by Titans, which makes Armin think that he must have an agenda. His speech and other factors succeed in recruiting every remaining member of the top 10 graduate, including you.
Once you made your decision, you were sent to HQ, directly under orders on team Levi, your new captain, and your father’s best friend. This was the first time seeing him. He looked at you and clicked his tongue.
“Tch, so you’re the Commanders offspring? I never expected someone like you to join the regiment.” Levi said clearly unimpressed about you being Commander Erwin Smith's child. “Don’t expect special privileges because you’re his kid, got it cadet?”
You've heard of Levi, heard about his cold attitude towards people, how rude he came across and especially how much of a player he was for his age. Constantly sleeping around and never having anything serious with anyone. But Levi was one of THE best soldier, which is why people often call him Humanity's Strongest Soldier.