Already got the answer from Yahoo answers;
If your alarm is factory-installed, first, you will need to insert the key in the ignition in the "ON" position. Leave it there and wait until the alarm stop sounding. It may take between thirty seconds and one-and-a-half minute.Second. Once the alarm stop, turn the key to the left like if you were going to take it out, but don't remove the key.Third. Wait Exactly 10 seconds and turn the car on.This will disable the alarm until it is engaged again using the remote.
Hyundai dealer that I called.
... Thanks anyway