Stuntman Cha Dal-geon gets involved in a tragic airplane crash and ends up discovering a national corruption scandal in the process. Go Hae-ri, the oldest daughter of a deceased marine, decides to work for the National Intelligence Service as a secret ops agent in order to support her mom and younger siblings, although all she wanted to do is to become a civil servant.

A group of deadly assassins kidnap a hostage in the hope of getting a high ransom but when they manage to lose themselves in a forest and end up spending the night in a haunted house they manage to disrupt the plans of the ghosts to descend to heaven. The assassins hatch a plan to solve the problem but in doing so reveal themselves to be incompetent, so the ghosts decide to give them some training themselves…

After long and grueling hours immersed in brutal crime investigations, lead detective Choi Young Jin must face the particular horrors of singlehandedly raising her daughter Ha Eun. Any way you look at it, Young Jin’s got her work cut out for her, but it’s only a matter of time before her professional and personal worlds collide in new and disastrous ways.