its a game sort of like world of warcraft except the game theme is on the historical Silkroad.
just another korean-made mmorpg, this one is free though, and ingame experience is not bad at all.
although you COULD try private server world of warcraft, which is free as well but less players than the official world of warcraft.
other possible choices are:
knight online (too many turkish players)
conquer online (not 3d, so dont except breath-taking ingame experience, but lots of players so you make friends fast, and there is marriage and spouse)
kal online (dunno much about this, only a few people around d2jsp play it)
dont play runescape unless you have 10+ real friends who play it as well
its basically for the chatting.