William and Dinah in “Unfinished Business”

William

You know, Roy told me this would only bring me pain, and he was right. I'm going home.

Dinah

Just like that, huh, without any answers?

William

Felicity is dead. And before that, she had a plan to blow up an entire city. So I'm not sire exactly why I'm supposed to care about what happened to her. I'm just sorry I dragged you all into this.

Dinah

You need to see something. [unrolls her jacket sleeve showing a tattoo] It's called the mark of four. Your dad came up with it.

William

I don't remember that.

Dinah

You were already gone. It was right before everything. It symbolizes the 4 pillars of heroism - courage, compassion, selflessness, and loyalty. We all got them as a reminder that no matter what happened, if one of us was in trouble, the other ones would be there. That's why Roy came with you back to Star City. He saw the symbol written on the inside of your father's bow.

William

So that's why you're helping us?

Dinah

I didn't know what to make of you at first. Trust doesn't come so easy.

William

Yeah? So what changed?

Dinah

I started seeing the best part of your dad in you - the strength that made him a hero.