C1031 Iron Tetrad

"Yes, boss!"

Upon hearing the order, the six lackeys all took out daggers, switchblades, and other weapons from their pockets.

"You dare to kick this young master, you big idiot. You're dead for sure tonight!"

With a sinister smile, Matt extended his right hand and secretly put on an iron ring on his finger …

The so-called iron four evils, the author also seems to have mentioned before