When one accidental killing leads to another, an ordinary young man finds himself stuck in an endless cat-and-mouse chase with a shrewd detective.

With little on her resume but full of passion, Park Yoonjo manages to get hired by a top company through an unbiased recruitment project. Proving her value at work is hard, but she powers through life with her old friend and colleague Ryu Jaemin, role model Goo Yijung, and best supporter Seo Donghoon.

A woman's life is turned upside-down when a dangerous man gets a hold of her lost cell phone and uses it to track her every move.