Hey @Kona Hyun I'm in the same situation as you, basically the mechanism inside is broken (apparently this can happen if it slid close with too much force); here's how to take the top part of the box off (I'll try and take some pictures as I attempt to fix the mechanism tonight):
1/ You will need to take the sides and the front plastic covers off. They are held on with double sided sticky take *and* plastic tabs; be careful not to break them off like I did.
2/ When the top lid is in the closed position, it's held on to the rails with two pins at the front. These have little tabs that you can push in on both sides with your fingers to open. *SLIDE BACKWARDS*
3/ Keep pushing the tabs in to open the latch and *slide backwards* the top tray, it will come free off the rails this way. If you slide forwards the mechanism will lock on similar pins but at the back of the enclosure with aren't accessible.
The top tray is held together by screws from the bottom, you will need to disassemble this way to get access to the mechanism to fix it.