Watch "While You Were Sleeping: Season 1" on Netflix Ireland

Even with her extraordinary gift, Nam Hong-ju has never been able to change the future. But with her mother's life at stake, she's determined to try.

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Finding this déjà vu all too impossible to believe, Jeong Jae-chan brushes Hong-ju aside and attempts to adjust to his new role as a prosecutor.

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Three people with the same mysterious ability converge at a crime scene. But that doesn't stop Jeong Seung-won from resenting his spineless brother.

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After seeing a tragedy unfold in his dream, Han U-tak invites a different guest to dinner. Jae-chan finds more people to fight on his side.

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Hong-ju debates whether to go back to work. U-tak comes up with a theory to explain what made him, Jae-chan and Hong-ju special.

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Back at her old job, Hong-ju investigates a mass killing. Jae-chan comes head-to-head with Lee Yu-beom on a homicide case.

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Hong-ju's heart grows heavy as she's unable to protect another loved one from danger. An old roommate pays U-tak a late-night visit with a request.

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As Jae-chan interrogates Do Hak-yeong, he finds that the pieces don't add up for a conviction. Could it be that his only suspect is actually innocent?

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Yu-beom pits the public against Hak-yeong, which means Jae-chan will have to search for irrefutable evidence that would put all suspicion to rest.

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An old note stirs up repressed memories for Hong-ju as she remembers the day she almost killed a person out of spite. Jae-chan confronts his attacker.

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A renowned author seeks Yu-beom to discuss his next "murder mystery." Jae-chan takes a few days off to strategize for a case that may end his career.

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Knowing who he's up against, Jae-chan meticulously prepares for court. But first, he must convince the 5-year-old key witness to open up.

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Seung-won asks Jae-chan to revisit an old case. The police capture a cellphone thief who may hold the key to a $10,000 device.

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An investigation forces Jae-chan to doubt a person he trusts. Was it really more than luck that brought Choi Dam-dong to the site of the fire?

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With Ha Ju-an pegged as the culprit for all the murders, Yu-beom may walk free. But he becomes nervous when he learns that a witness is still alive.

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As the case leans in their favor, Jae-chan fears that Yu-beom is a flight risk. U-tak testifies in court, knowing that he'll have to give up his badge.

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