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24 Episodes 2020 - 2020
Episode 1
30 mins
Hyeong Ju loses one of his closest friends. This is when he receives a phone call from an unknown caller telling him that he can go back a year in time.

Episode 2
30 mins
The first group of people to go back in time is selected and the reset becomes the reality. However, at the first meeting after the reset, they hear about the death of one of the group members.

Episode 3
30 mins
What seemed to be a free opportunity for a better life sends Ga Hyeon into a downward spiral when she finds her friend, Ju Young, as the victim of exactly the same accident that she got into.

Episode 4
30 mins
After losing Ju Young from exactly the same accident as hers before the reset, Ga Hyeon decides to find the driver who killed her friend.

Episode 5
30 mins
The police find the dead body of Yeon Soo at the park where she met with Ga Hyeon on the night before. When Ga Hyeon is summoned to be questioned as a testifier, she has no choice but to hide the details regarding the reset.
Episode 6
30 mins
After the investigation at the police station, Ga Hyeon helps Hyeong Ju track down Bae Jung Tae, who might hold the key to the recent mysterious deaths of fellow resetters.
Episode 7
30 mins
Ga Hyeon and Hyeong Ju eventually get in touch with Jung Tae and in doing so, they find out about his relationship with Jeung Seok. The more they look into the mysterious deaths of the resetters, the clues direct them toward Lee Shin.
Episode 8
30 mins
Ga Hyeon and Hyeong Ju are certain that Jung Tae is the bad guy and Jeung Seok is just one of his many victims. However, this all flips around when they come across a conversation between Jung Tae and Jeung Seok.
Episode 9
30 mins
When the resetters are gathered at the meeting organized by Lee Shin, they get a basket of flowers with a memo pointing to the next target.
Episode 10
30 mins
Ga Hyeon and Hyeong Ju stumble upon So Hye In, the pregnant lady from the meeting before the reset who decided not to travel back in time.
Episode 11
30 mins
It turns out that the bouquets were sent by Ms. Song under Lee Shin's order but when Ga Hyeon and Hyeong Ju found out about it, Lee Shin was already gone. What was thought to be an arson was just a mere accident at the flower shop.
Episode 12
30 mins
Ga Hyeon and Hyeong Ju finally figure out the true meaning behind the message, the date of death. However, this time, no one dies on the date they expected.
Episode 13
30 mins
Lee Shin shows herself at the café where the resetters were discussing the dead truck driver. This is when Lee Shin reveals the fact that the resetters were all dead in previous resets.
Episode 14
30 mins
As suggested by Lee Shin, Se Rin tries to flee from Seoul with Young Woong. However, Young Woong leaves Se Rin at the bus terminal to meet Hyeong Ju to file a suit against her.
Episode 15
30 mins
Ga Hyeon struggles to decide whether to help Se Rin or to ignore her for her deceitful wrong doings. Even before she had time to make a decision, Se Rin is found dead.
Episode 16
30 mins
It was no surprise when Hyeong Ju finds out Jae Young was with Se Rin hours before she was murdered. Meanwhile, Jung Tae is threatened by Jae Young's father, a nominee for the Minister of Education, to stay low until the hearing is over.
Episode 17
30 mins
While Hyeong Ju is acting suspiciously for some reason, a voice recording is delivered to the police station. This triggers Ga Hyeon to investigate the voice recording. She concludes that Hyeong Ju could actually be the culprit.
Episode 18
30 mins
Hyeong Ju feels irritated that Ga Hyeon suspected him of the murder of Jung Tae. Meanwhile, Sun Ho asks Hyeong Ju to explain certain things he's been having a hard time understanding.
Episode 19
30 mins
Sun Ho turns out to be the murderer who caused the deaths of resetters. However, Hyeong Ju does not have a clue about it and reports every detail of his investigation to him.
Episode 20
30 mins
Putting the pieces of a puzzle together, Ga Hyeon finds out who the real culprit is and successfully confirms his identity.
Episode 21
30 mins
Hyeong Ju and Ga Hyeon find out that Sun Ho is the real culprit who is responsible for the deaths of resetters. In fact, they also realize that Ga Hyeon's house is wiretapped by Sun Ho.
Episode 22
30 mins
Luring Sun Ho into Hyeong Ju's trap was easy, and the police arrest him right after he fires a gun at Hyeong Ju. It seemed as if everything was over, but Hyeong Ju discovers a shocking secret.
Episode 23
30 mins
Lee Shin struggles to decide whether to help Ga Hyeon and Hyeong Ju or to once again go through the reset to avoid her daughter's death.
Episode 24
30 mins
Attempting to stop Professor Hwang from making use of the reset for his personal enjoyment, Hyeong Ju dives into his second reset with the help of Lee Shin.