Baek Hee Sung seems like the ideal husband. Working as a craftsman, his hard work allowed his metal-working studio to meet with its fair share of success. Able to provide a good life for his wife and daughter, he’s a good example of what a husband should be. But this perfect façade hides some very dark secrets that even his wife, Cha Ji Won remains unaware of. Unfortunately, secrets have a way of coming out and as a hard-hitting homicide detective, it’s Cha Ji Won’s job to uncover as many of them as she can, in her never-ending quest for the truth. While investigating a particularly cruel case, she finds herself on a dark path that could crumble the very foundations of her happy life. But she is determined to bring this psychopath to justice. Delving deeper into the case, she realizes that he may have been close by all along.