Sigeuneol plot
Hae-Young works as a criminal profiler and is also a lieutenant in the police force. Although he is an officer, he does not trust police officers due to his own past experiences. Hae-Young meets a journalist in a café to make shocking revelations about a celebrity scandal. Meanwhile, experienced Detective Soo-Hyun is present in the café to monitor the meeting, unaware that Hae-Young is an officer. She arrests Hae-Young for stalking celebrities. As Hae-Young leaves the police station, he sees a walkie-talkie talking to him. It is Detective Jae-Han, who comes from the year 2000 and is investigating the disappearance of one of Hae-Young's elementary school classmates. Hae-Young and Detective Jae-Han begin communicating with each other via the walkie-talkie.