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The drama  centers around Cha Woo Kyung, a child psychologist whose seemingly perfect life is overturned after a tragic accident occurs. She ends up running into Detective Kang Ji Hyun, who is investigating a set of mysterious homicides that involve different forms of child abuse, where lines of poems are left behind as clues, and who are all somehow connected as well to Woo Kyung. As the drama progresses, Woo Kyung also discovers that not everything in her past is what it seems, and works to discover the truth about her past.

This drama was the very definition of a great psychological thriller, as every single element in the drama kept you guessing and kept you at the edge of your seat all the way until the end.

During a trip to a mountain, several kids disappear, and only one is rescued. A few days later, one of the missing kids reappears, but he has become an adult over the course of the last few days. Is he a dangerous predator or a victim of time?

The series revolves around Yoon Jong-Woo, an aspiring crime fiction writer in his twenties who moves to Seoul in search of a better life. Cash-strapped, he resorts to living in a tiny communal residence or goshiwon named Eden Studio, alongside some eerie tenants. Though not thrilled about either the quality of the place or its residents, and despite many red flags, he decides to put up with the rundown place for a couple of months until he can save enough money to move out. However, incongruous occurrences keep happening, making him paranoid, anxious and scared.

Following her father's murder, a revenge-driven woman puts her trust in a powerful crime boss — and infiltrates the police force under his direction.

A group of 10 people gets an opportunity to reset their lives and travel back one year into the past. These people become resetters and traveled back into the past with the hopes to create a better future for themselves. However, what awaits is not happier changes but rather a dreadful nightmare where each of the resetters start dying one by one. Now, the remaining survivors must try their utmost best to escape death. Thus, begins an intense survival game where they fight against their destiny

An accident  occurring seventeen years ago has left Byeong Soo with traumatic head injury-induced dementia that is slowly causing him to lose his memories. In a desperate attempt to recall these memories that are slowly slipping away from him, he keeps a detailed journal of his life – including his past crimes as a vigilante murderer – to remind himself of his past. However, when a local series of murders begin once more and Byeong Soo becomes convinced he knows the culprit, he must race against his own rapidly diminishing grasp on reality to stop the murderer before his daughter becomes the killers next target.

A group of spies called the 5446 Corps were trained by North Korean elite special forces since their youth, ostensibly towards the lofty goal of unifying Korea. They are ambitiously dispatched to South Korea, where each disguises himself as a fool, an aspiring singer, and a high school student. Passing boring time without receiving any orders from the North, they gradually get used to life as ordinary neighbors in a small town until one day, their mundane lives are turned upside down when a "secret and great" mission is suddenly assigned to them.

A mysterious walkie-talkie allows a detective in the year 1986 to communicate with a cold case profiler from 2015; with the power of fore and hindsight the two not only solve crimes but prevent them from ever taking place.

Whatever gets the job done. Bong Sang Pil  grew up living the gangster life, full of tough physical fights and evading the law. When his mother dies a tragic death, he is determined to avenge her death. Sang Pil becomes a lawyer and begins to go after people with absolute power who think they are beyond the law. With the cunning and skills from his previous life, Sang Pil uses both his fists and legal loopholes to amass an impressive winning record.

A suspenseful story that asks the key question, “What if we could identify psychopaths in advance?” A crazed serial killer’s ruthless murders have left the entire nation gripped with fear, and chaos reigns. Justice-seeking rookie police officer, Jung Ba Reum, comes face to face with the killer. While he survives his dangerous encounter with the psychopath, Jung Ba Reum finds his life completely changing before his eyes.