I'm confused about "have been".

I was in Korea but now I'm not (in Korea). <<< correct

I have been to Korea. --------- These sentences mean the same thing.
I have been in Korea.                     (maybe you didn't stay very long)

Can anyone explain this to me about this,
I'd like to know which sentence is correct and which sentence is incorrect.
and which one is best.

I have been there (before).  = I have been to (visited) Korea sometime before now. I'm not there now.
I have been been in Korea. ---------same

I have lived in Korea. =  I have actually lived in Korea (before now). I do not live there now.

I'm confuesed confused about "have been" form 

I was in Korea but not now. 

I have been Korea

Is there a word missing here? Without a verb this is a relatively incomplete sentence. 

I have been to Korea

This the best form to use. It implies your visitation to the country. 

I was in korea but not now

You wouldn't really say you were "In" a country. Like it's okay to say, "I was in that room, but not now", but that's a different situation. Saying that you were "in" a country is sort of incorrect. Since you are speaking in the past  tense - "I was" you do not need to tell people, "but now now" because the usage of "I was" sheds enough understanding  to the listener to know that you are no longer there. Either way, I would not use this form. 

and... I have been there. it means I was there but not now. isn't it?

As I said before, since you are already applying the past tense, "I have" it is implied that you are no longer there, so you do not need to tell the listener, but not now. If you want, you can make two sentences. "I have been to Korea. I went there for vacation." or something to that effect. 

and ... I have been been korea. // I have lived korea.
it means i'm living in korea now .

I have lived in Korea

Doesn't mean you are living in Korea now. Adding "d" to "live" and the "have" sets the sentence in past tense. As it is in the past, the listener will think it is no longer the truth. If you want to tell someone you are living in Korean you can say:

I currently live in Korea. 

I live in Korea now. 

I am living in Korea. 

Hope my advice is of some help!