I wanna to understand more details about the PvP system of t : KO Discussion

I wanna to understand more details about the PvP system of this game

I am seeking a free mmorpg with a good PvP, then, please, I hope someone can answer my humble questions:

1- I already played several games that have so many penalties related to PvP that really make the PvP impracticable. I wanna to know which kind of penalties and limitations exist about the PvP of this game.

2- If the PvP is viable in this game, I wanna to know If we receive something doing the PvP, like, is possible to loot the "corpse" of the player killed or we receive more XP ? We drop some iten or equipment when we are "killed" ?

3- The PvP only happens in definite PvP areas , like arenas or something like this, or can happens in everywhere ? for instance, I am just fighting against some monster in some area, and sudden a player can attack me ? Is really fun the "thriller" of feel that sudden someone can attack me, but, is boring games that The PvP only happens in some few definite areas...

4- The PvP system of this game is like "Realm vs Realm" that I can choose a realm and automatically all players from the opositive realm will become my enemy, then, I will be free to kill everybody from the other realm ? ( I really love this kind of PvP )

I not played this game yet, I am waiting for the anwer first. Thank you.

No one can answer these question, please ?

Id say go with cabal online as i think it will suit you more