If you want to be SURE, you are best off not buying an accident-damaged vehicle. So many things may have been damaged, or improperly repaired that even Scotty would have a hard time spotting them. Sheet metal can be bent, destroying it's corrosion-resistant coating, electrical wiring can be damaged, suspension and steering components can be subtly bent - and these are VERY hard to spot, or may only show up as damaged after a considerable number of miles.

Now, if you've got a local Scotty level mechanic to check things out, and you are getting a suitable price reduction (which the mechanic can advise you on), then you might want to roll the dice.

I would not take the chance, not from a dealer, not in an accident and certainly not from anything Carfax says.  What is the outrageous price they are asking?  I notice you left that part out.

Agree with Glen_Stet. One other step you might try, see if there is any paperwork in the glovebox with the previous owner's info. Twice I have bought used cars from dealers and found such paperwork, which enabled me to contact the previous owners and ask them questions about the car. Good luck.

"Should I run away?? What should I do to make sure I am not gonna buy a lemon???"

Personally I would run away, there are too many used vehicles out there to pick from that have not been wrecked.

That price is outrageous.  Run away.