Basically, the problem is on the wire, I'm quite sure that somewhere in the wire had snapped, causing the earphone to malfunction at one side.
Day 1 night, I prepared a CAT5 cable, which is the LAN cable. We stripped it down and picked 4 wire for recabling.
Opening up the driver
So far, I had not really tested how was the sound like. But the first impression is it is very airy, bass is not that heavy compared to the original cable. But it was a nice experience. p.s. I stabbed my thumb with a screwdriver while I am trying to open the driver :s
My friend, SantikSengthong gets some credits as he helped me to solder the whole thing