Played the Chinese version of it till lvl146 with my gang of friends consist of 6 fella. Its best to find 6 friends to play along. Cause the levelling system in this game is different from other games, you will need to have a full party to effectively level up. And the party must at least consist of a healer. Healer is not easy to find in the game as their part will only be healing and buffing up others. No attacking power at all. Pot spamming will never happen in this game cause the potion is so expensive and heal too little.
Another bad thing I dont like bout this game is that, during pk, there will be no strategy as each job can KO each other in one hit.