A dysfunctional couple head to a remote lakeside cabin under the guise of reconnecting, but each has secret designs to kill the other. Before they can carry out their respective plans, unexpected visitors arrive and the couple is faced with a greater danger than anything they could have plotted.
Ah-young, a grown orphan with government aid cut off, starts working as a nanny for Young-chae, a single mother who works at a bar. One day, while Ah-young is asleep, Young-chae comes home drunk and seriously injures her baby by mistake.