koreans mmorpgs the true must be know >;\

Because of people like you, that accept boring grindfests completely devoid of content, is that Koreans will keep on making this king of game. They're just milking it. There are at least 10 games exactly like this one, and they don't even bother in faking it. They're just in for the Item Shop money. Normally you grind til you reach a certain low/medium level when some feature will be available to you. Then after that you just play to be UBER, that's when you feel how painfully slow you're leveling, and then you buy gear/experience tickets in the Item Shop.

You don't NEED to grind in an RPG.
You can roleplay and do other activities