Season 4

Strange emails are sent to Kwon Joo. She thinks they’re just prank emails, but soon, she realizes the emails have been forewarning her of murders. She starts to track down who sent the emails. Meanwhile, Derek Cho, a detective from the U.S., is working temporarily in Korea. He has a younger sister who has a speech impediment, but she’s abducted and in danger.

Kwon Joo and Derek finally meet in person at the Vimo Provincial Police Agency. However, when Derek checks the suspect’s face on the CCTV footage from the airport, he does not hesitate to point his gun at Kwon Joo. Meanwhile, a call comes in about a mysterious wild animal that dragged a person off in Mosim Forest.

The call center receives a phone call from the missing woman, Jang Ye Sook. Kwon Joo tries her best to hear anything over the phone that might help the team get to Ye Sook in time. Meanwhile, Derek, who joins the Golden Time Team, finds a piece of clothing with a bite mark on it. The team puts all of their effort into saving the victim before it is too late.

The Golden Time Team heads to the hospital in search of the fleeing suspect, Gong Su Ji. Meanwhile, Han Woo Ju, a cyber agent who runs the fansite for the Golden Time Team, brings in a helpful clue. Then, a call center receives a report about a haenyeo who claims to have seen her granddaughter’s dead body in a cauldron in the sea.

Kwon Joo’s team and Derek continue to look for Su Ji and Ga Eun. Su Ji’s belongings and what seems to be her will are found near the beach, and the local police officers assume that Su Ji committed suicide. Meanwhile, Ga Eun who was abducted by the drug smugglers tries to run away, risking her life.

Kwon Joo’s profiling leads to the conclusion that the Circus Man is in fact a man with multiple personalities. Derek and the Golden Time Team continue questioning the suspect as Dae Shik rejoins the dispatch team. Meanwhile, a call comes into the 112 call center from a man who is being chased by someone with a knife. Kwon Joo sends the Golden Time Team to the scene.

Kang Man Ho’s father, Kang Seok Chun, is supposedly dead on paper. However, he is still alive, and his hidden story comes to light. Meanwhile, Derek hears the truth from Director Yang about his mom’s death 28 years ago. Also, Woo Ju sets up a trap online to catch the Circus Man. Meanwhile, a mysterious user approaches him.

The Golden Time Team conducts a discreet operation to catch the user they believe to be Circus Man. Meanwhile, Eun Soo volunteers to transfer to the dispatch team. As they chase down Circus Man, a local high school teacher calls the 112 Call Center about his student who has gone missing after leaving an ominous voicemail.

Derek and Dae Shik finally catch the man who is suspected to have abducted and confined Saet Byul and Hyo Joon in a motel room. But he says he was also forced by a woman for money. Eun Soo manages to enter the motel and finds a path that leads to a hidden room. Meanwhile, Kwon Joo bumps into a stranger in a stairway, but she instantly recognizes him by his voice.

The man who Kwon Joo bumped into in the stairway was Dong Bang Min. He threatens Kwon Joo with a knife. Fortunately, Derek and Dae Sik arrive to save Kwon Joo. Dong Bang Min soon gets released thanks to the connection between the Commissioner General and his grandfather, the head of Sonang Village. Meanwhile, Kwon Joo and Derek find out more about Joo Bum Tae from his schoolmate. And they also hear about a kidnapper who is quite short.

The Golden Time Team arrests and interrogates Kwak Man Taek, the man who works for Dong Bang Min, after he confesses that he is the Circus Man. However, during the interrogation, he has a seizure and acts very strangely. Meanwhile, Kwon Joo figures something out while analyzing Dong Bang Min’s many voices. Then, someone breaks into the Golden Time Team’s lodgings.

Kwon Joo and Derek chase after the person who snuck into the dorm. Kwon Joo sees something from a past dream that she had. Derek saves her from imminent danger, and they find out why they both saw strange visions. As the secrets of Sonang Village slowly come to light, Woo Ju informs the team that Saet Byeol has disappeared from the shelter.