Lee Da-Il is a private investigator. He was formerly in the military, but a whistleblower case led to his discharge. Jung Yeo-Wool becomes his assistant. She is a fearless woman. They work together to solve a mystery surrounding the death of a younger sibling. They also work together to solve other cases, some involving ghosts.
Sunwoo Hye is trying to kill hundreds of lives by controlling Gyeol. The team must find out why and how she is intending on killing those people. Da Il re-members something about Sunwoo Hye and tries to connect the dots.
The team arrives at the house they located, but Da Il is nowhere to be found and they only find traces of him. Sun woo Hye confronts Yeo Wool and gives her an opportunity to take revenge. Sang Seob comes to help and falls into a trap.
A reporter who seems to know something about Da Il pays the team a visit. Sunwoo Hye is tracking down her own mother by using Gyeol. Yeo Wool and Da Il are always a step behind Sunwoo Hye, but they find a lead at the pharmacy.Watch Now:Amazon
Jeong Dae asks Yeo Wool to tell the truth as her fingerprint was found at the crime scene. Yeo Wool tries to tell Jeong Dae that she was the one who stabbed Hye, but Da Il tells her to deny it. Meanwhile, Da Il records a video of a man who saw Hye at the hospital and sends it to Eun Chong.Watch Now:Amazon
Just when Gyeol is about to stab himself, Da Il disappears. Sunwoo Hye goes to Deok Joong and asks him what really happened to Da Il. Not knowing if Da Il will appear again, Yeo Wool waits for him.
After talking with Sunwoo Hye, Da Il's anger grows even bigger. The men who are being controlled by Sunwoo Hye try to take the hearing aid from Yeo Wool. Da Il goes after the source of his anger.
Sunwoo Hye's goal is to kill everyone around Yeo Wool and Da Il. Jeong Dae tells Yeo Wool that it'll be better if he doesn't know anything about her plans. Meanwhile, Gyeol takes Sunwoo Hye to Da Il's body.
Yeo Wool is back home. After getting some rest, she heads to the hospital where Da Il is being treated. However, Da Il thinks it's not over yet.
Da Il suspects that the teacher at the academy is the person who abducted the three kids. While working on the case at the office, an aspiring detective pays him a visit. However, after a strange turn of events, Da Il meets a tragic end.Watch Now:Amazon
In order to stop people from getting hurt more, Yeo Wool decides to let Sunwoo Hye possess her body. Da Il asks her not to, but Yeo Wool is not willing to change her mind. Chae Won and Da Il must come up with a new plan to get rid of Sunwoo Hye.
In order to protect the people he loves, Da Il chooses to sacrifice himself. Yeo Wool remembers him as the person who tried to understand Sunwoo Hye until the last moment. When she goes to bed one night, Yi Rang comes to her.
Yeo Wool thinks it's strange that Da Il disappeared from the crime scene, leav-ing the kids behind. The police investigating the case also finds the case strange. Meanwhile, Yeo Wool keeps looking for Da Il and worries that some-thing might have happened to him.
Da Il gets a feeling that Yi Rang's hearing aid will provide a clue to find out more about the woman in red. With Yeo Wool, he follows the lead. The woman in red's next target is the principal of the pre-school.
It turns out that the police officer Sang Seob was looking for killed himself 20 years ago. Da Il senses that Sang Seob is in imminent danger. They must find him before it's too late.
The “A Few Good Men” Team rushes to the hospital where Sunwoo Hye is supposedly hospitalized. However, they quickly discover that Sunwoo Hye had already made a run for it. Through the help of Sunwoo Hye’s nurse, Jeon Deok Joong, Da Il and Yeo Wool chase after Sunwoo Hye from all possible directions.Watch Now:Amazon
Yeo Wool and Da Il go and meet a shaman hoping to gain information on how to kill a fetch. Knowing that they would get into trouble, Chae Won goes to help them and ends up saving them in the nick of time. Later, the group decides whether or not what the shaman had told them is worth doing.
Da Il learns how to touch objects and stabs Hye with a knife before Yeo Wool does. Hye becomes a living person and runs away from the hospital after killing four medical staff, and Yeo Wool thinks it all happened because of her as she was not the one who stabbed Hye.Watch Now:Amazon
The team must take a different approach now that Sunwoo Hye has a body. With a body that can move, her scope of action has broadened. Meanwhile, Da Il goes to the interrogation room where Deok Joong is being held.Watch Now:Amazon
Sunwoo Hye relentlessly harasses Yeo Wool. She tries to control Gyeol's feel-ing of guilt in order to get rid of her. Meanwhile, the team tries to find out where Da Il's body is being kept.
Along with finding Da Il's body, Sunwoo Hye also wants to possess Yeo Wool. Da Il must find a way to get rid of her without harming Yeo Wool. Meanwhile, Jeong Dae is looking for Da Il's body on his own.
Da Il arrives at the grape farm and finds his body. Yeo Wool manages to find where Da Il went and goes after him, but Sunwoo Hye is already there. Chae Won confronts Sunwoo Hye and tries to buy some time for Jeong Dae.
Sunwoo Hye takes Attorney Baek hostage and escapes from where she was being confined. The people who have suffered because of Sunwoo Hye all gather forces to track her down. Meanwhile, Sunwoo Hye executes her plan to kill everyone that Da Il loves.
Da Il comes to Yeo Wool's house and asks her about what she knows. From Yeo Wool's story, he learns more about the mysterious woman he saw. Togeth-er, they start looking for clues.Watch Now:Amazon
Da Il and Sang Seob run a detective agency that is on the verge of going out of business. One day, a client comes to them, asking to find a missing child. However, the more Da Il digs, the stranger the case becomes.
The manager of the restaurant Yi Rang used to work at jumps off a building af-ter saying something ominous. Da Il can't help but feel sympathy toward Yeo Woo because he knows very well how she must be feeling right now. The woman in red is coming for them.Watch Now:Amazon