"The Glory's" intricate plot culminates in the complete and systematic ruin of all five of Moon Dong-eun's tormentors, achieved through masterful psychological manipulation rather than direct violence. Park Yeon-jin, the ringleader, is the final and main target. Dong-eun reveals that Yeon-jin murdered not only the bullies' first victim, Yoon So-hee, years ago but also Son Myeong-o in the present. Dong-eun masterfully manipulates evidence, leading to Yeon-jin being arrested. In a final, cruel twist, Dong-eun uses Yeon-jin's own mother, who commits a crime to protect her daughter, and then forces the mother to give a statement that implicates Yeon-jin, leading to her complete abandonment. Yeon-jin ends up in prison, where she is ironically bullied and tormented by other inmates, her polished world shattered forever.
The other bullies meet similarly fitting ends. Jeon Jae-joon, after learning he is the biological father of Yeon-jin's daughter, is blinded (a karmic punishment for his colorblindness being the key to the paternity secret) and then pushed into a pool of wet cement by Choi Hye-jeong and Ha Do-yeong. The drug-addicted artist Lee Sa-ra is imprisoned for tax evasion and for stabbing Choi Hye-jeong in the neck with a pen, which renders Hye-jeong mute—a cruel irony for someone who used her voice to mock others. Son Myeong-o was already dead, killed by Yeon-jin with a liquor bottle after he tried to blackmail her. Dong-eun ensures that all of their secrets are exposed and they turn on each other, becoming the architects of their own destruction.
After achieving her revenge, Dong-eun initially intends to commit suicide, having fulfilled her life's sole purpose. However, Joo Yeo-jeong's mother intervenes, begging her to stay and save her son from his own consuming desire for revenge. Dong-eun chooses to live and becomes Yeo-jeong's "executioner." The series ends with them working together at Jisan Prison, where Yeo-jeong's father's killer is an inmate, beginning a new, shared quest for justice.