Major Twists and Narrative Climax:
- The Murder Revelation: So-young is revealed to have murdered the baby's biological father—a wealthy client from her past as a sex worker—after he pressured her to terminate the pregnancy and attempted violence against her.
- The Gangster Threat: The murdered man’s wealthy widow hires gangsters to track down baby Woo-sung to secure her late husband's inheritance and seek vengeance on So-young.
- Sang-hyeon’s Sacrifice: In the climax, Sang-hyeon secretly meets the lead gangster Tae-ho. Realizing the child and So-young will never be safe while the syndicate pursues them, Sang-hyeon murders Tae-ho, takes the syndicate's payoff money, and disappears into the shadows as a permanent fugitive to eliminate the threat.
- The Sting and Surrender: Dong-soo meets the final prospective adoptive couple—a genuinely loving pair arranged without financial extortion—and willingly allows himself to be arrested by Soo-jin to protect So-young, while So-young turns herself in voluntarily for the manslaughter of the child's father.
The Resolution (3 Years Later): So-young is released on parole and works at a laundromat. Detective Soo-jin, transformed by the case, fosters Woo-sung and invites Dong-soo, Hae-jin, and So-young to meet at a park. In the final shot, Sang-hyeon's van is seen watching from a distance, suggesting that though legally separated, their shared bond remains intact.