Finally I've moved back. It was a more painful process than moving out. Over the years, I've accumulated so much stuff that its unimaginable that one can squeeze so much things into a small bedroom. I must have 10 boxes of things and carrying them down the stairs repeatedly, and staying not at lift level is literary a pain in the neck.
My resolution for the rest of the year:
no more shopping, no more hoarding
My goal for my next move is just to pull a luggage and move to a new place. Wish me luck.