Metallic buzz - How do I fix it?

Hi everyone, I'm new with the ukulele. I bought my first one two months ago. It's a concert size, and overall it sounds amazing. My only problem is that when I pick hard the first string on the second fret, it does a HORRIBLE metallic buzz that drives me crazy.
This is specially problematic because I cannot play a G chord or an E minor chord loudly without getting that annoying buzzing sound. I'm also playing some pieces with chord melodies, and that ruins it all.

Is there a way to solve this problem? It's ONLY in the second fret of the first string. If I pick the same first string hard on any other fret or even open, it sounds fine.

Thanks in advance!

If you bought it new then you can ask the seller to fix it or to exchange it for one without an buzzes. If it's not a new one and you want to learn something then you could start with Barry's hints:
https://www.gotaukulele.com/2010/09/buzzes-and-rattles-on-ukulele.html

You might find some useful help here:
https://forum.ukuleleunderground.com/showthread.php?10546-Buzzing-on-String-Instruments-Causes-and-Cures