The aftermath of four young girls who died as a sacrifice and after they were sexually abused urged the detectives to work harder. Yoo Seung Ho and Lee Se Young fight back to gather more evidence to capture the suspect.
Episode 4 opens with Dong Baek joining the cult ceremony rites. He disguised himself as one of the baptized participants to hold the hand of cult leader Park Gi Dan. Just in time, detective Han Su Mi arrived and saw Dong Baek hold tightly the leader's hand. In a few minutes, Dong Baek read the mind and past actions of the cult head. His face turned red and fumed with anger as he told the leader that he committed murder. He then told Dong Baek to not give such accusations to the famous man in the country. Dong Baek was about to punch but Han Su Mi stopped him.
Han Su Mi tried to acquire a search warrant and look for more evidence in Park Di Gan's house. Dong Baek helped her secure the documents. When Han Su Mi reached the house, the housekeeper burnt the journals and repainted the walls. Dong Baek felt weak, knowing that parts of the clues that point to the cult leader as the murderer are gone.
Meanwhile, Goo Kyung Tan, the team chief, contacted a media reporter. They plan to broadcast the crime the cult leader did to the young girls. But the reporters decline to help them with no legal support and bases only from Dong Baek's telepathic accounts. Han Su Mi asked Dong Baek that they need to check all the details and connect all of his recollections of the crime.
Dong Baek's partner Oh Se Hoon said that a missing piece that was used to rape the victims was not in the report and a pair of gloves was found by the police. Dong Baek's memories from the cult leader showed him as the one holding the hammer. Han Su Mi concluded that the missing gloves were left in the crime scene. They went right away to the site and found the missing gloves in one of the pipe holes, though they needed equipment to get it. Han Su Mi and Dong Baek went out of the cave then saw men with a cement mixer truck about to fill the ground. They tried to stop the truck unloading the cement but Dong Baek was knocked down by the men.
They lost all the evidence in putting the cult leader to prison. Dong Baek called the office, and the police commissioner put him on witness stand for a trial. They directed him not to use any of his telepathic abilities to anyone to avoid any indefinite accusations. Before Dong Baek accepted the rules, he stood up and exposed cult leader Park Di Gan to the public. All the media in the room made Dong Baek's exposure to a live broadcast. Park Di Gan was furious. The police then forced and grabbed Dong Baek out of the room.
The following day, Han Su Mi called Dong Baek to meet her at the cult house. As soon as Dong Baek arrived and went inside. He saw the body of cult leader Park Di Gan in his blood lying on the floor dead. Han Su Mi at a loss for words before urging Dong Baek to touch the people in the room to get their memories and find out who killed the leader.
