The DDII body arrived in great shape, but I heard a peculiar sound. I shook it just a little, trying to determine if it's broken, and the left leg came off! It didn't totally come off, just hanging by the knee. Of course I panicked because I never encountered DDII problem before, and thought it was broken.
So I went to read, thank you DollfieDreams.com forum members (I read other people who encountered the same thing) DDII diagrams on Flickr and this video really helped: