Is this is a famous song and singer? Really curious!!!!

I heard this song about two years ago and I kinda liked it, but never heard it a lot of after that. But now that I started watching drama recently. I was wondering if this is a popular song and singer? http://www.youtube.com/watch?v=4JaxfCUxofY . Also their is a bollywood version of this song also. http://www.youtube.com/watch?v=hnZnxKzerTc . I want a vote which one do you like better???

I have never heard the Korean version before but I did know the Pehli Nazar - Bollywood version - which one is the original..?