Weary homicide detective Yoo Jin Kook (Park Sung Woong) doesn’t have much to look forward to in life besides his younger sister, Yoo Jin Kang (Jung So Min), whom he’s fiercely protective of. While investigating a suspicious death, all signs point to the victim’s boyfriend, Kim Moo Yeong (Seo In Guk), a seemingly charming man with a dark side. But when Moo Yeong starts dating Jin Kang, Jin Kook becomes determined to end their relationship. Can he shield her from the looming threat, or is the real danger closer than he thinks?

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