The narrative contains several major revelations that recontextualize the entire plot:
- Jin Yi-kyung's Death: Originally framed as a suicide caused by bullying, it is revealed that teacher Do Jung-woo had groomed and exploited Yi-kyung. When she threatened to expose his sexual misconduct and school financial corruption, Jung-woo pushed her off the rooftop and used corrupt police contacts to stage a suicide.
- Do Jung-woo's Lineage: Do Jung-woo is the illegitimate, unacknowledged son of presidential candidate Kang Soo-chan, who treats Jung-woo merely as an expendable asset to collect illicit political funds.
- Ah-ran's True Paternity and Dong-chil's Guilt: Ahn Dong-chil spent seventeen years terrorizing Kang-ja under the belief that she killed his younger brother. In truth, Dong-chil himself accidentally killed his brother during a physical fight and framed Kang-ja. Furthermore, Dong-chil discovers that Ah-ran is his brother’s child—his biological niece. Devastated by this revelation, he turns against Chairman Hong to protect her.
- The Building Collapse: Chairman Hong Sang-bok diverts safety and construction budgets into political donations. Consequently, the new annex collapses during school hours, injuring and killing students and destroying any chance of a cover-up.
- The Series Finale: Dong-chil provides the foundation's hidden financial ledgers, and whistleblowing testimonies from Bok-dong and Joo Ae-yeon secure legal convictions. Kang Soo-chan is sentenced to seven years in prison, while Do Jung-woo and Hong Sang-bok receive long sentences. Dong-chil serves two years and is forgiven by Kang-ja. The closing voiceover reveals that institutional elites still operate in the shadows, but ordinary citizens will continue fighting for their children.