Hi Reza. Sorry you haven't gotten an answer yet. We had a big hint thread when the game was released in a few countries that got unstickied and I didn't link to it but I'll do so now.
http://forums.adventuregamers.com/sh...ight=runaway+2
You can search in that thread to see if there's an answer to your question. I haven't played the game yet (just a bit of the demo).