Set in the neon-drenched, rain-slicked underbelly of New Seoul, *The Stray Cat* follows the double life of Ji-woo, a seemingly docile archivist by day and the city's most elusive black-market information broker, codenamed "Nabi" (Korean for cat), by night. Driven by a burning need to uncover the truth behind her parents' suspicious demise inside the monolithic conglomerate Hankook Bio, Ji-woo trades in secrets, blackmail, and stolen corporate data to inch closer to the CEO, Chairman Kang.The precarious balance of her clandestine existence shatters when she intercepts an encrypted drive containing evidence of illegal human trials conducted by Hankook Bio. Pursued by Kang’s ruthless head of security, Tae-jin—a man with whom Ji-woo shares a volatile, chemically charged history—she barely escapes into the city's labyrinthine slums. Seeking refuge, she crosses paths with Do-jin, a disgraced former detective desperately searching for his abducted sister. Recognizing that their targets are intertwined, an uneasy alliance is forged. Do-jin provides brute force and investigative grit, while Ji-woo brings unmatched tactical brilliance and underworld access.As the duo digs deeper, the conspiracy widens far beyond corporate greed, implicating high-ranking government officials who rely on Hankook Bio’s illicit biological research for immortality treatments. Along the way, the tension between Ji-woo and Do-jin shifts from mutual suspicion to a raw, consuming intimacy, complicated further by Tae-jin’s relentless
psychological warfare and his conflicting loyalty to Chairman Kang. Tae-jin captures Do-jin, forcing Ji-woo into a high-stakes trap at an abandoned shipyard. Refusing to let another person she cares about be taken from her, Ji-woo orchestrates a bloody, brilliantly executed
rescue operation, pushing her mind and body to the absolute brink.The climax erupts during a lavish annual gala hosted by Hankook Bio. Utilizing her cover as a low-level archivist, Ji-woo infiltrates the inner sanctum to broadcast the stolen data to the global media, while Do-jin confronts Tae-jin in a brutal, visceral hand-to-hand brawl that settles old scores. In the fiery aftermath, Chairman Kang’s empire collapses, and the corrupt officials are exposed. Yet, victory comes at a steep cost; framed for murder, Ji-woo is forced to fake her death and disappear once more into the Seoul shadows. The series concludes with Ji-woo perched on a rain-slicked rooftop, watching over the city—no longer just a stray, but the apex predator of the night, waiting for the next ghost of her past to surface.