In 2004, 17-year-old high school student Moon Dong-eun is ruthlessly bullied and tortured by a group of her rich peers, led by Park Yeon-jin and including Jeon Jae-joon, Choi Hye-jeong, Lee Sa-ra and Son Myeong-oh. Dong-eun files a police report but Yeon-jin's mother, Young-ae, uses her connections with Young-joon, a high-ranking police officer, to cover up the incident. Dong-eun applies to drop out of school, listing the group as the reason. Her teacher Jong-moon beats her in front of other teachers for "lying". Yeon-jin's mother bribes Dong-eun's mother to change the reason on the form to "maladjustment". After taking the money, Dong-eun's mother abandons her. Before moving away, Dong-eun vows to the group that "they'll meet again". Over the next few years, she works at a factory, befriends fellow worker Sung-hee, earns a GED and enrolls into university to study education. In 2022, an adult Dong-eun watches Yeon-jin, now a weather presenter, on television, surrounded by photographs of those who have wronged her.
While studying, Dong-eun gathers information on the group over the years. Jae-joon inherits a country club and upscale clothing boutique and has a fling with Yeon-jin; Hye-jeong becomes a flight attendant and has unrequited feelings for Jae-joon; Sa-ra becomes a famous artist and drug addict; Myeong-oh becomes Jae-joon's lackey and Sa-ra's drug dealer. Dong-eun meets Joo Yeo-jeong, a medical intern who has a crush on her and teaches her the game go Yeon-jin marries Ha Do-yeong, the CEO of a large construction company, and has a daughter, Ha Ye-sol. After graduating, Dong-eun abruptly leaves without telling Yeo-jeong. She meets Myeong-oh and tells him she has information he can use to make money. She leases an apartment in Semyeong overlooking Yeon-jin's house. One night, while searching the bins at the house of Semyeong Foundation's chairman, Dong-eun is confronted by the housekeeper, Kang Hyeon-nam. Rather than turn Dong-eun in, Hyeon-nam offers to help Dong-eun if she kills her abusive husband.
Yeo-jeong admits he knew about Dong-eun's situation from the start. Dong-eun admits she approached him to ensure So-hee's body stay frozen. Yeon-jin and Young-ae are both arrested on suspicion of murder. Detective Choi realizes Dong-eun orchestrated the chain of events, but decides to close the investigation. Young-joon is beaten to death by his former subordinates over money. Jae-joon goes blind from eye medication tampered by Hye-jeong with Dong-eun's help and drowns after being pushed into a pool of wet concrete by someone implied to be Do-yeong. Do-yeong and Ye-sol relocate to the UK. So-hee is laid to rest. It is revealed that Myeong-oh was found alive by Kyung-ran, but she panicked after experiencing flashbacks of Myeong-oh's sexual assault and delivered the killing blow with the same bottle. Kyung-ran contacted Dong-eun, who framed Yeon-jin. Dong-eun and Yeo-jeong enjoy a night out, but she leaves without warning. Hyeon-nam gives farewell gifts from Dong-eun to Sung-hee and Jung-mi. Dong-eun burns her materials and plans to end her life by jumping off the same place where So-hee died, but is interrupted by Sang-im. Six months later, Dong-eun and Yeo-jeong carry out a plan to infiltrate the prison where Yeong-cheon is held. Dong-eun becomes a teacher again and starts tutoring a student whose father is a policy maker for Korean prisons. Yeo-jeong becomes a doctor at Jisan prison, which holds the most notorious criminals. Yeong-cheon is cornered by his inmates and is severely beaten before being transferred to Jisan. Dong-eun leads classes for inmates who are about to be released and Yeo-jeong ensures that they are in good health. Yeong-cheon is escorted by guards and sees Yeo-jeong standing by the corridor. He gets flashbacks of his conversations with Yeo-jeong, and becomes fearful. Dong-eun and Yeo-jeong are seen walking together towards the prison, and the doors close behind them.
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