I am happy to know this site.

Hi.
I am live in Seoul and Gangnam.
Many people could may know Gangnam by from Psy's "Gangnam Style". 
It looks like a lot of fun in that music video.
In my villige village, traffic is bumper to bumper, but it is convenient for living. If someone anyone would like to visit in Korea, I wanna would want to introduce them to Seoul~

Capitalization and puncuations are very important in writing. Other than that, good job!

i am happy to know this site

hi
i am live in seoul and gangnam
(many people could would know gangnam by psy"gangnam style" )
it looks fun that music video that music video looks fun
my villige traffic is bumper to bumper
but convenient for living. if someone will visit in korea, i wanna introduce seoul~

Original

i am happy to know this site

hi
i am live in seoul and gangnam
(many people could know gangnam by psy"gangnam style" )
it looks fun that music video
my villige traffic is bumper to bumper
but convenient for living. if someone visit in korea, i wanna introduce seoul~

Corrected

I am happy to know this site.

Hi.

I live in Seoul and Gangnam.

(Many people know Gangnam by Psy's 'Gangnam Style')

That music video looks fun.

In my village, traffic is bumper to bumper, but it's/ it is convenient for living.

If anyone would like to visit Korea, I would want to introduce them to Seoul.

I am happy to know this site.

Hi, I am live in Seoul and Gangnam

(many people could know Gangnam by though PSY "Gangnam Style").

it looks fun That music video looks fun.

my villige The traffic in my village is bumper to bumper but it is convenient for living.

If someone anyone were to visit in korea, I wanna would want to introduce them Seoul~