Today, after Psy's free concert at Seoul City Plaza, citizens stayed behind to clean up the garbage and mess that was created after the concert was over.

This showed how dedicated and classy Psy's fans were as they cleaned up the dirty streets.

Psy performed in front of almost 80,000 people at today's concert to express his gratitude for sticking by him all these years.

He sang many of his hit songs as well as the song that made him a global star, "Gangnam Style."

Psy has recently become a global sensation with his song, "Gangnam Style." He has ranked number 1 on iTunes in 30 countries and has ranked number 2 on the U.S. Billboard Main Single Chart 'HOT 100'.

He has appeared on many shows such as the "Ellen Show" and "SNL" and featured on news programs such as NBC and CNN.

His music video has been the most viewed on Youtube as well with over 350 million views.

He has also recently signed a contract with Justin Bieber's agency and plans to release his first U.S. single sometime in November.