I 비둘기 deep into my mind and I pondered over this, and then it hit me. WHAT IF. Steve is Julien's 로스트 twin brother? Maybe Julien's parents couldn't bother, 또는 didn't care to take care of two children, so they sent one away. It's logically impossible for two people to look so alike! Unless if you're twins-I mean some brilliant mind could've cloned Julien...But I think Julien would remember getting cloned...unless if he was brainwashed.
I may not have much evidence other than looking similar thing, but I can't think of any other way. (except for the cloning)