There is only one reason why they freak out at a single word from Rhyu Si-min...

Scammers use incredibly difficult language, talking in circles, twisting and turning their words
for three or four hours straight.
But then, someone stands by and says, "Oh, that's a scam," providing clear, accurate, and concise evidence
without even needing to drone on.
That's why those piece-of-trash scammers freak out every time that person speaks, thinking, "That person is exposing us."
Summary: They want to scam people, but he keeps exposing them so they can't. And he does it so clearly that even a fool passing by on the street can understand...