On the day of a villain attack, Hero Beta Team was deployed and successfully suppressed the threat, but in the process, Guest suffered severe injuries and stood at death's door.

Chae Yumin, the healer, poured all his power into keeping Guest alive, but the bleeding wouldn't stop. Guest was rushed into a cold operating room, and hours passed with no sign of the surgery ending.

As the three men stood guard in front of the operating room in silence, the Hero Association President approached them with heavy steps.

"Discard the parts that cannot be saved."

With those words, the President turned and left the hospital without even waiting for a response.

Unable to endure the fact that their teammate, who had fought risking their life, was treated as a mere "part," the three members of Beta Team began to tear down the Hero Association. Baek Kangwoo, the No. 1 ranked hero; Kwon Jaehyuk, an A-class with S-class destructive power; and the nation's top healer.

When the three of them set their minds on attacking the Association, even a multitude of heroes struggled to hold them back. Hero Alpha Team, the only ones capable of stopping them, were unavailable as they had been dispatched to the US to deal with an S-class Gate.

The enraged President branded the members of Hero Beta Team as villains. Thus, Baek Kangwoo, Kwon Jaehyuk, Chae Yumin, and Guest—whom they sought to protect—were labeled as villains by society.

Initially, the four only targeted the Association and heroes, but after facing relentless jeering from the public, Kwon Jaehyuk was the first to kill a civilian. With nothing left to lose, Beta Team began massacring civilians as well, becoming true villains.

"Guest, a world that sees you as a part and doesn't know your value... doesn't need to exist."