How is it different? I'll list some below XD

But i think first thing is that there's some variety of the high level boss..even at a high level they're pretty hard to beat..especially the black dragon.
But because it drops level 75 armor, challenging it doesn't hurt. But beating it with the combination of team, teamwork, and skill builds is another.

Although the graphic engine looks like RO..the gameplay is actually good..not just the usual leveling..There are alot of things to do once you reach around level 15(ur first ship to sail to sea), level 20 (your first trading pass to finally earn some great bucks), level 30(your first time to enter maze), level40(second class change + chances of entering the Four Season Islands for a grand challenge) and so on XD
Is hard to get bored even at a higher level..

I'm currently level 65 in the taiwan server, and alot of the places are still very challenging for me. And of course, fun is the main factor.

I would definitly try this game out if you're looking for more than just a plain old leveling game

Some of the gameplay system below..

Maze System adds challenge to users who wish to try to obtain sealed armor that's better than just normal ones ( + weapons too)

Ship System to fight on the sea or travel around the world map
Your world map will not be fully explored when you play, but it'll be expanded and explored as you travel to those places.

Life Skills..Your Ship(or Ships), can be equipped with fishing or netting(for getting treasure or junks)..
Wood can restock the ship's energy.
Mining ores can be used on forging weapons later.

Challenging Area : Black Dragon Cave
The prize to challenging area is black dragon armors. They're the best armor in KOP. Sealed armor goes up to level 65, but dragon armor can go up to level 75 with better stats

Trading system combined with the Ship system..at level 20 user can get their first pass to trade on ports depending on what the city wants
Higher level pass will enable user to pay less tax so you can gain more profit on the item you have gained
(EX: If the city wants pottery..and they'll buy one for 100 dollars..if tax is 20%..u'll get 100-(100x0.20) .

Grand History Quest..start from level 10 and will take some time to finish as you level..The quest will split into two parts
People with negative reputation will start at the darkness side of the quest, and people with 0 or higher reputation will start at the good side of the quest.
It'll also earn you life skills experience points to learn life skills.

Big World Map System..Splits into 3 mainlands..not sure what they'll be translated as yet. But just to get an idea of the world.
Taken from the china site..this shows the whole map of the game
http://www.moliyo.com/GameKop/kop/map.swf

Test your Fortune System at the "Spring Island"(or whatever name it'll be when it is out)
The NPC will give you a Fortune, and it can be good or bad
The kind of fortune u can test is splited into two

One kind is : Lose or Experience money, Lose or Win money from counted from the money you're carrying,Add chance to gaining items, and old treasure map to activate a treasure hunt .

The other kind is : Lose or gain Experience points, extra boost(atk+ effect, def+ effect etc), and old treasure map to activate a treasure hunt ..

Some of the grand prizes for the treasure hunt is level 75 gear and forging stones that cannot be acquired from monsters.

Pets!Train your pet to help you boost your sats and decide which skills your pet should learn. It'll help you to recover SP, HP and more ~