James Randi wrote about this exact boy HERE:
As you might have seen on a video clip from one of the programs I did on Seoul Broadcasting a few years ago, I defeated the similar claims of a Chinese gentleman who even stuck a porcelain toilet-lid to his own son’s chest to prove how magnetic his whole family was. I dusted father and son with talcum powder, and their powers evaporated…
The writeup on the referenced Chinese gentleman is HERE.
Randi also points out that aluminum and copper stick to him (not sure where this was seen/documented), and that this rules out the magnetism hypothesis.
So... does this disprove this specific case? Not necessarily. The family would simply need to be willing to douse their son in oil or talcum powder or have him put on a shirt to really illustrate that it's not a hoax. Prior incidences of similar "powers" having been disproved sways me much more in the "hoax" direction.