It seems that Khan Online Philippines added an additional revenue model to its MMORPG game. They introduced the game premium items. Players can convert a khan game card into khan online currency which is tugrik. P20 = 200 tugrik, P50 = 500 tugrik, P100= 1000 tugrik and P300 = 3000Tugrik.
I was able to use and still using the 40% KI bonus, 40% EXP bonus and the enchant protection (for refining protection of your items). Ki and exp bonuses will last 90 minutes then you need to get another one.
My personal opinion about these premium items. Khan Online made a good work here. I love it.