Your Secret

"Your deadly secrets are being traded somewhere in the shadows!"
Detective Dae-young finds himself a prime suspect in a mysterious murder case and discovers that a secret trading site called 'Your Secret' is connected to the incident, leading him to pursue the truth.

Secrets and Leverage
Detective Dae-young of the Major Crimes Unit suffers from blackouts whenever he drinks. As an alcoholic, he takes photos while intoxicated to reconstruct the lost hours. While conducting surveillance on rental scam artist Du-il, Dae-young succumbs to temptation and drinks again. Later, Du-il appears and snaps him back to consciousness and reveals he purchased Dae-young's secret from a site called "Your Secret". The secret: Dae-young's wife Hae-in is having an affair, her lover Na Tae-gon has mysteriously disappeared and may have been murdered, and circumstantial evidence points to Dae-young as the prime suspect.

Sale and Purchase
An unidentified dismembered body is discovered in a gray suitcase near Han River Park. Dae-young instinctively knows it's Tae-gon and begins watching Hae-in closely—the suitcase she was dragging on the day Tae-gon disappeared matches the model containing the body. Believing it's only a matter of time before Hae-in becomes a suspect, Dae-young takes charge of investigating the case to erase traces of her activities that day. To uncover the truth, he accesses "Your Secret." Risking exposure, he successfully registers by posting a secret about witnessing someone else's affair, and that sells immediately upon posting. Dae-young realizes the scale of "Your Secret" is beyond imagination.

Suspicion and Conviction
Hae-in, a former journalist and current parliamentary aide, suspects that Daeyoung discovered her affair and murdered Tae-gon. Her suspicions deepen when the dismembered body is found and DNA testing confirms it's Tae-gon. Finding multiple blurry photos on Dae-young's phone and bloodstained evidence in his car trunk that appears to have been cleaned from a crime scene, Hae-in is shocked. Convinced that Dae-young killed Tae-gon and manipulated her into disposing of the dismembered body to frame her, she transfers the evidence to her own car. Armed with proof of her innocence and Daeyoung's guilt, she independently investigates the case's secrets. However, as potential witnesses who could prove her innocence die one by one, she finds herself increasingly cornered as the prime suspect.

Suspicion and Conviction
Hae-in suspects Dae-young conspired with Seol Su-yeon, Tae-gon's wife who provided his DNA, and begins surveillance. Daeyoung also believes Su-yeon has motive for the crime and stakes out her house. The two eventually meet at the same location. Hae-in and Dae-young piece together their respective discoveries and theorize that someone used “Your Secret" to commit the crime. However, Hae-in can't let go of her suspicions about Dae-young, while another deadly secret is registered on "Your Secret." Someone purchases that secret, seizing both their tails and preparing to shake the body...
Dae-young creates a game-changing twist in the case. In his own way.