Working in TV series marketing, Ji-sun’s daily life is like a war: not only struggling hard at work, she’s involved in a custody battle for her 18-month-old daughter Da-eun. The baby Da-eun spends most of the time with the nanny Han-mae. Luckily, Da-eun seems to get along well with her nanny. One day, when Ji-sun gets back home after work, she finds both Han-mae and Da-eun disappeared. Due to the custody battle, Ji-sun doesn’t dare to call the police. She starts by asking the neighbor who first introduced Han-mae. But the neighbor already quit the job and Han-mae’s certification turns out to be someone else’s…