In a sea of pretty pop stars, a chubby, rapping dancer may not be the usual K-pop hit.

But an unconventional South Korean has found himself turned into a viral sensation.

Psy is the latest musician to have an internet hit.

In just under a month, his music video "Gangnam Style" notched up over 20 million views on YouTube.

While he's been a local musician for a decade, Psy says he never expected to break overseas.

Even now, he admits he's an unlikely role model.

SOUNDBITE: SOUTH KOREAN SINGER PSY SAYING (Korean):

"I have been looking for fun my whole life. You may think it's sad, but that's the aim of my whole life. If I hadn't become a musician, I would most likely have been a loser. I was very lazy - just liked drinking, night clubs and girls."

The performer is not without controversy.

While landing in hot water for antics off-stage, his performances are also unusual.

Fans packed in to a South Korean stadium were recently treated to a Lady Gaga parody, complete with pyrotechnics.

Psy will perform his first concert in Japan this September.