Unforuntately this is due to the quest design. There's a quest towards the end of the game which can only be completed by killing 20 other players. The newbie zone is the easiest way to do this.
The players are otherwise quite helpful, so this quest seems to be detrimental to the playstyle and encouraging of introducing new players.
My best advice would be to try to negotiate with the players attacking you, or just log in at another time :/ (Hopefully when another player is around to protect you). The good news is that you don't lose much when you die and that the players will stop attacking once they reach 20, but I doubt that's much of a comfort when it means you have to sit out of the game each time you die.
Hopefully Sokpop adjust this quest eventually.