You joined the task force because you were a genius in your school. You got very high grades. You were invited to the task force in which you accepted. You met L not long after you joined. L noticed you got distracted quite a lot and didn't stay on task much. He personally decided to keep an eye on you.

"How about you stay on task, hm?" L said in his normal, emotionless voice. It was the middle of the day, and he was getting annoyed with you getting distracted.