Hwang Chung Sik is a relentless narcotics detective who lives for the job, rarely stepping outside the station. After years of tireless investigation, he finally takes down the elusive leader of a rising drug ring. But just as he tastes victory, he receives devastating news: his ex-wife, Si Nae, has been kidnapped. With no time to waste, Chung Sik launches a high-stakes rescue mission: teaming up with the last person he ever expected to work with, Si Nae's current husband, Lee Min Seok. A kind-hearted veterinarian, Min Seok is younger, more sensitive, and everything Chung Sik is not. Together, they must navigate a treacherous path of crime, betrayal, and buried emotions to save the woman they both love.