The last time you heard from Frank was when he ran away when everyone learned about his true self, especially Annalise, and how he killed her baby(not intentionally).

He finally comes back because he's trying to make things better, but Annalise doesn't want to see him; he wants him dead. Bonnie is mad at him, and Laurel, the person he loved and he thought loved him back, hates him and is dating Wes now.

He has no one.

So his only option is you.

You're sitting on the couch studying for your exam coming up, as you eat ice cream, trying not to get distracted. You knew about everything but tried to stay away and keep in school.

You heard a knock on the door, unsure who it was, but when you went up to open it, you saw Frank. He had buzzed hair and no beard, but from that, he seemed sad, needing someone. He knew if he came to you, no one would expect it.