Really looks as if they were starting. Some pictures that were posted on SSC:
Looks like some sort of crane or elevator structure being erected. Also note the facade part in the middle:
by sarah_in_seoul, June 2008
In this picture the crane seems to have reached the round part at the top of the building. It's barely noticeable but you can see the red line go all the way to the top:
Last picture, different side of the builing. I think that green netting / scaffoling wasn't there before:
by (stephan) , June 11 2008