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Lee Ahn (Jinyoung) è un ragazzo che ha l'incredibile potere di sentire i segreti delle altre persone tramite un semplice tocco. Yoon Jae In (Shin Ye Eun) è una ragazza pronta a fare di tutto per nascondere un traumatico segreto. Cosa succederà quando i loro mondi si incontreranno?

Il professore di matematica che è stato licenziato dopo che Jae In ha scoperto la verità cerca vendetta. An appare al momento giusto per salvare Jae In e continua a starle affianco per proteggerla. Tuttavia, il segreto che Jae In voleva nascondere da tutti quanti viene rivelato, lei scompare.

Dopo due anni, An e Jae In si incontrano di nuovo. Jae In ora è una poliziotta mentre An non sembra aver fatto grandi progressi nel perfezionare le sue abilità psicometriche. Mentre i due stanno cercando una bambina scomparsa, An trova una valigia sospetta che si scopre contenere un cadavere. I due riusciranno a trovare il killer?

Seong Mo chiede a Jae In di aiutare An nel migliorare le sue abilitá psicometriche. Mentre Jae In esita nel lasciare che An usi le sue abilità su di lei, An si rende conto che lei é la bambina dei suoi ricordi. Nel frattempo, la Dottoressa Hong identifica is corpo nella valigia, e mentre segue Seung Mo, An incontra un uomo misterioso.

Come voleva Seong Mo, Jae In promette di allenare le abilitá di An. Dopo essere stato rilasciato dall’ospedale, An, insieme a Jae In, iniziano a leggere libri su crimini. Per trovare piú informazioni sulla vera Kang Hee Sook, Ji Soo chiama An e Jae In nella sala delle autopsie.

An si rende conto che la sua abilità può migliorare e aiutare gli altri solo se si mette alla prova. Con calma e determinazione, sta lavorando per cambiare. Con l'abilità di An, Seong Mo e Ji Soo trovano l'assassino e raccolgono informazioni sulla sua gang. Il loro piano é quello di fare un attacco a sorpresa nel quartier generale della gang, ma il piano viene rifiutato a causa di mancanza di prove e testimoni.

An and Jae In gets caught after infiltrating Dragon Head Hunting. Soon after they fight their way out, the police raid the building with overwhelming manpower. After a successful raid and interrogating the thugs, Ji Soo and Seung Mo realize this case is bigger than they imagined.

Dr. Hong and Ji Soo discover something strange from the autopsy of Kang Eun Joo. Moreover, they are shocked that the composite sketch of Kang Hee Sook looks like Eun Joo. Meanwhile, An and Jae In go on a first date. With his unusual ability, An accidentally finds out that Jae In’s father was the culprit of the arson at Yeongseong Apartment.

An is terribly shocked to know that Jae In’s father was the arsonist of Yeongseong Apartment fire, and he runs away from Jae In. Ji Soo strongly believes that Seong Mo’s mother is still alive and is now living as Kim Song Hee. However, Ji Soo doesn’t understand why Seong Mo keeps it as a secret to her. Meanwhile, the security camera around the security center is down again, and Jae In runs into a suspicious man.

Jae In is kidnapped by a mysterious man who looks familiar to her. Although the police have his picture from the security camera footage, they still can’t catch him. Seong Mo disappears and Ji Soo keeps tracing where Eun Joo is and finds out that she attempted suicide on the day she made a briefing about Kim Gab Yong and the two victims. Meanwhile, Ji Soo investigates Eun Joo’s background and is about to dig out Seong Mo’s awful childhood.

Ji Soo, together with Jae In and An, go to where Eun Joo first lived and find out her and Seong Mo’s painful past, that they were trapped in a basement with shackles for nine years. Besides, they also find out that Yeongseong Apartment fire, Hanmin Care Home fire, the murder of Kim Gab Yong were all committed by Kang Geun Taek, the man who confined Seong Mo and Eun Joo and abducted Jae In. However, there is another cruel truth awaiting Ji Soo.

An finds out that Seong Mo knew Kang Geun Taek was at Kangguk Station and that he sent An and Jae In to somewhere else to save their lives. An keeps blaming himself. Meanwhile, Eun Joo is questioned by the police. She starts to talk everything she remembers from the Hanmin Care Home.

An tries to make Eun Joo talk again, but he fails to get anything from her. Meanwhile, the police find surveillance camera footage of Seong Mo. According to the footage, they start to track Seong Mo. Jae in and Lieutenant Nam head to a hospital where they believe Geun Taek is confined.

Seong Mo takes Eun Joo out from the police station. After Seong Mo helps Eun Joo’s identity get reinstated, they part ways. Meanwhile, An starts to track what he saw in his vision, and he ends up at Yeongseong Apartment. An and the police find Kang Geun Taek in an empty unit. An also sees what Seong Mo did in the past in the apartment.

An sees in his vision that it was Seong Mo who framed Geun Taek to protect his mother. Found at Unit 1501, right before his arrest Seong Mo confesses to An about everything. Seong Mo admits all of his crimes and even hands out the ledger he had that includes all bribery behind YSS Construction and high authorities. Jae In, An, and the whole Investigative Unit come together to finally put things back to where it should be.