Changed for reconsideration >.>
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Solution:
Adding to disable_pvm: false from Cyro to the group.conf oddly didn't work at first until I restarted pc, not server. Weird.
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Reference:
^Not enough information nor did it solved anything.
I cannot find the source what is going on? All I remember was changing the group.conf and skill.conf, save and re-compile. Since then I cannot hit but follow the monsters every time I click on them. Because I did not drastically changed anything, I've decided that because it was default before I've reverted it back to its originality by using the rathena document. It still didn't solve anything. I am using packet_ver:30, 2012-04-10a.
If you guys know how to fix this, please let me know. Don't leave me hanging.