Jeon Na-bi runs a small beauty salon in a neighborhood with poor security. The identity of this woman who has been worried that there have been no intruders breaking into her house recently, is actually a man-eating monster. She does not kill anyone randomly, but rather, she only targets and kills sex offenders who break into her house. When Na-bi was running low on food, she captured Kang Eun-chan, a contract killer who broke into her house. Eun-chan, who was asked to kill her, was instantly subdued by Na-bi, who is smaller and weaker than him, and was confined in her secret bunker... Eun-chan gradually falls for Na-bi's coercive but meticulous care, and ends up becoming Na-bi's lunch box. Na-bi strangely finds cute to Eun-chan, who is too good looking to eat. And then, men who want to be ruled by her for different reasons appear! A love thriller comedy begins with a spoonful of Na-bi and Eunchan's blood!