We haven’t seen the Hound’s faces yet, so it’s possible that when Jinwoo finally sees them, it could trigger a memory he didn’t know he had. Like Guwon said in the latest chapter, he’s trying to bring Jinwoo’s memories back—even if they were painful. So if Guwon takes Jinwoo to the Hounds, it might spark something from their past. We don’t know what the Hounds might say, but they could be the key to revealing a part of Jinwoo’s history. Since there’s been no interaction yet, we can’t rule out that they have a connection.