Jeon Nabi runs a small hair salon in a neighborhood with weak law enforcement. Lately, she’s been troubled by the fact that unwanted intruders keep breaking into her home. But the truth is… Nabi is actually a man-eating monster. Rather than killing indiscriminately, she selectively targets only the criminals who break into her home—specifically, sex offenders. However, just as her "food supply" starts running low, she captures an unexpected intruder: contract killer Kang Eunchan. Eunchan had been hired to assassinate her, but before he could act, he was swiftly overpowered by the petite yet deceptively strong Nabi and locked away in her secret underground shelter. Though her methods are forceful, Nabi's care is oddly meticulous(?), and before long, Eunchan finds himself drawn to her, willingly becoming her personal "lunchbox." Meanwhile, Nabi—who initially saw Eunchan as nothing more than a meal—begins to find his striking looks too attractive to devour. With new men appearing, each with their own reasons for wanting to submit to her control, the twisted, bloodstained love-thriller-comedy of Nabi and Eunchan begins!