His name is Wesley Russell. The security company was unable to provide it, but someone provided me a link to his facebook and the tattoos match between his profile photos on both his accounts to pictures taken by me and other fans that night.
UPDATE 10/3/18 5:30pm:
The guard is being fired by the security company that contracted him tomorrow morning.
The manager is also asking his partner if he can release the guys last name as well, but his first name is definitely Wesley, he wasn't lying about that.
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I was one of the fans chosen for the raffle to be up front and go on stage for The Rose's performance at K-Expo 2018
As soon as the security guard on stage right/house left noticed that at least two of the members spoke English he began to harass their fans and started to say racist things about the boys.
Although I didn't get footage of all of the incident, this is what I have and it's pretty damning.
I have called the Melrose Ballroom box office and my phone number was forwarded to their upper management, but they still have not responded to me and I don't think they ever will.
This behavior is completely unacceptable and he needs to be punished by his management. I understand that the venue hires outside security companies but they need to actually respond to the fan complaints and notify the security company he's from.