Set in a hyper-stylized, crime-ridden Seoul, *City Hunter* follows Lee Yoon-sung, a brilliant Massachusetts Institute of Technology graduate who infiltrates the South Korean Blue House as an elite IT expert. Secretly, Yoon-sung’s true motivation is revenge. Raised from infancy by his fierce
surrogate father, Lee Jin-pyo, a survivor of a brutal state-sponsored military massacre in 1983, Yoon-sung was trained in martial arts and weaponry to assassinate the five corrupt politicians responsible for his biological father's death and the betrayal of the strike team.Upon returning to South Korea, Yoon-sung adopts the vigilante moniker "City Hunter," meting out public, humiliating justice to corrupt elites that the law cannot touch. However, Jin-pyo demands lethal executions, while Yoon-sung operates under a strict moral code to spare lives and expose their crimes instead. This ideological clash creates intense
psychological tension between the surrogate father and son.Complicating his dangerous double life, Yoon-sung falls in love with Kim Nana, a resilient Blue House bodyguard working to support her comatose father. Nana becomes unwittingly entangled in the City Hunter’s world, frequently risking her life to protect the President while unwittingly growing closer to Yoon-sung, who hides his vigilante identity to keep her safe. Meanwhile, Kim Young-joo, an idealistic and relentless prosecutor, makes it his personal mission to hunt down the City Hunter, viewing him as a criminal despite inadvertently targeting the same corrupt officials.As the conspiracy unravels, the stakes heighten dramatically. Yoon-sung discovers that the current President of South Korea is not only one of the original corrupt targets responsible for the 1983 massacre, but also his biological father. This shocking revelation shatters Yoon-sung's worldview and forces him to reevaluate his quest for vengeance. Jin-pyo intensifies his ruthless campaign, hunting down the remaining targets with lethal force and putting himself directly in Yoon-sung’s path.In a climactic confrontation at the Blue House, Jin-pyo attempts to execute the President and claim ultimate revenge, but Yoon-sung intervenes to stop the cycle of bloodshed, taking the brunt of Jin-pyo’s wrath. To save Yoon-sung and shield him from prosecution, Jin-pyo sacrifices his own life, claiming ultimate responsibility for the City Hunter persona. Months later, with the corrupt politicians exposed and imprisoned, the slate is wiped clean. Yoon-sung steps out of the shadows, reuniting with Nana in a poignant finale that promises a peaceful future built on justice rather than vengeance.