You probably won't see them on this site since they probably get flagged under banned content. Yea, definitely fake. I personally wouldn't bother uploading it if someone decides to flag it, I would feel like I'm wasting my time.

https://www.gaytorrent.ru/notallowed.php
The following TYPES OF PORN are not allowed, if real or claimed/appears to be real:

Child Exploitation or Underage Porn
    Shota (aka: shouta, shotacon, shotakon)
    Rape
    Snuff (Murder)
    Necrophilia (Sex with dead people)
    Cannibalism
    Bestiality (sex with or using animals)
    Mutilation & Blood Consumption
    Non-Sexual Bondage & Torture
    Intravenous Drug Use/Slamming/Shooting

Does anyone know if Mr. Korn has appeared in anything other than Brothers Junior vol.2 and MAN OMG 5?

Yea, I finally found it. I posted it here: https://www.gaytorrent.ru/details.php?id=ecf3026e5581abda288943443e7ab4fb2289be147792c6a6

The only ones I know of are GB Dangun and Glossymen.

I put up a collection from GB Dangun that is uncensored:
https://www.gaytorrent.ru/details.php?id=58cf0bdc9db5e458288943443e7ab4fb48016d3b77b78baa
https://www.gaytorrent.ru/details.php?id=a3a954b289218e3d288943443e7ab4fbb2d6664448d02335

Does anyone have KOC - Wanna Fuck You In School Blazers?

Alright, I found him. Different guy, but I pulled all the scenes I could find of him from JAPANBOYZ. https://www.gaytorrent.ru/details.php?id=2e0d3e78ccd341d4288943443e7ab4fb0ce80f8cc3637306

Is this Takumi Sugimoto? Still looking for that video from the picture you posted, but he looks similar to Takumi Sugimoto. Can't really tell..

It doesn't always work. If you purchase a U.S. prepaid VISA cards in the store, they are only accepted in the US, and if the porn sites doesn't actually use U.S. banking system for online transactions you're out of luck. Go to the payment section of whatever porn site you are trying to join and look at the payment options first before you buy the card. I ended up having prepaid cards just sitting on the table because I didn't check first. Sometime the sites will have multiple ways to pay.