Oh wow.. Maybe opening via the LCD is the correct way after way.. I did so much damage (brute force) to my phone when trying to pry it open [after learning it from Youtube]..
I think the LCD use a special adhesives repair glue, I saw it in some Youtube video.. I remember one of the repair video guy specifically mentioning about never ever use super glue to repair screen..
The case looks uneven and have permanent gaps.. I did tried to smoothen the bumps with a pilar. This extends to the sides as well. (I guess I got angry [broke my nail trying to open with bleeding finger last time])
But this time round I made two mistakes
1. Opening the case without ejecting the sim tray [Now the sim card tray cant close fully]
2. Use pen knife to scape off glue on battery compartment and accidently cut the mainboard ribbon cable [1/5 width of the cable]
Now my battery is unable to charge (Not sure if it's due to the cut..) and I've already ordered a new mainboard ribbon cable (~$5).
I've also bought a new my sim tray (~$4).. hopefully can fix it.