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Kim Seo-Jin is a man who is driven only to achieve success in his life. Thanks to his efforts, he is the youngest executive at his company. His life is perfect, with his beautiful violinist wife Kang Hyun-Chae and a daughter. His wonderful life comes to a halt when his young daughter is kidnapped. He falls deep into despair. To change the past, when his daughter was kidnapped, he contacts Han Ae-Ri approximately one month in the past. Han Ae-Ri has busy days with her studies and working a part-time job to make enough money to pay for her sick mother's operation. One day, her mother suddenly goes missing. Han Ae-Ri falls into despair, when Kim Seo-Jin from the future contacts her.
As the director of Yoojoong Constructions, Seo Jin hosts a violin recital where his wife performs in order to enhance the image of the company. However, the concert hall turns into chaos as their daughter Da Bin goes missing. Meanwhile, Ae Ri takes her mom to the hospital for surgery after getting a call that they have found a heart donor for her mom.
While Seo Jin hands out flyers to find his missing daughter, he gets a phone call from the kidnapper. Meanwhile, after Ae Ri’s mom goes to the hospital for the transplant surgery, she hears devastating news from her doctor that her mom’s condition is too bad to have heart transplant surgery and the donated heart will go to the next person on the list.
When Ae Ri goes back to the hospital, she finds that her mom is gone. Meanwhile, Seo Jin realizes that he is living a month ahead of Ae Ri. In order to save his wife and daughter, Seo Jin calls Ae Ri to tell the truth, but Ae Ri doesn’t believe Seo Jin.
Ae Ri asks Seo Jin to prove himself being in the future. He shares the winning numbers of the lottery, about her murder of Geon Wook, and in return asks her a favor. As unbelievable as it may seem, Ae Ri slowly starts trusting Seo Jin and visits his office in her time as he requested.
Seo Jin receives a call from the police that the culprit has been caught. When he rushes to the police station, he finds out that it was the very man who was protesting alone in the lobby of Yujung Constructions. Although it’s too late to save Da Bin, he believes he can still save her.
For a minute over the phone, Seo Jin informs Ae Ri of the name of the kidnapper and asks for help. While helping Seo Jin with the matter, Ae Ri receives a call from the hospital regarding her mother’s belongings. At the hospital, she finds out how Kim Jin Ho is also related to her mother’s disappearance.
When Ae Ri knocks on Kim Jin Ho’s door, Jin Ho panics and tries to force her into the house. That’s when Geon Wook shows up to save her, and the two start running away. After the incident, Ae Ri updates Seo Jin about the happening and tries to find the reason why she was chased.
Without knowing that someone close to him is hindering his efforts to bring back his family, Seo Jin desperately waits for Ae Ri’s phone call. At the same time, being unsure of the person who chased her at Jin Ho’s place, Ae Ri follows whatever lead she has acquired so far.
Although Seo Jin realizes that there must be more people involved in the kidnapping of his daughter, he still needs more information to be certain. Meanwhile, it turns out Hyun Chae was having an affair. While talking to Jin Ho, Ae Ri finds out about how her father met his death.
Seo Jin finally gets a phone call from Ae Ri. When he finds out that one of his close people tried to kill Ae Ri a while ago, he decides to persuade Jin Ho into helping him. However, Seo Jin doesn’t have a clue who else is involved in this matter.
After tracking down Lee Taek Gyu with a secretly planted GPS device, Seo Jin is shocked when he confronts a dead body hanging from some bars. After the incident, Seo Jin continues to look for Kwak Song Ja, Ae Ri’s mother, without realizing that he has already found her.
Although he realizes that the dead body is of Ae Ri’s mother, Seo Jin decides to keep his mouth shut, but instead, he informs Ae Ri about the time and place of her death. Meanwhile, Seo Jin gets surrounded by a group of policemen under the suspicion of Kwak Song Ja’s murder.
Kim Seo Jin hears about Kim Jin Ho’s suicide but goes on to further investigate the situation. Meanwhile, Ae Ri’s mother disappears again. Frustrated and desperate, Ae Ri decides to eliminate what might harm her mother, Lee Taek Gyu.
While Do Kyun is dissatisfied by the fact that Taek Gyu killed Kim Jin Ho, Seo Jin stumbles upon a clue that connects the dots between Do Kyun and Taek Gyu. With the help from Ae Ri, Seo Jin continues with his investigation and tracks down Da Bin’s teddy bear with a location tracker.
Ae Ri waits for the phone call, but it never reaches her. Worried that something might have happened to Seo Jin, Ae Ri does everything she can to keep Da Bin from getting kidnapped. In the end, Ae Ri, Geon Wook, and Soo Jung plan to sneak into the charity event in order to protect Da Bin. While doing so, Ae Ri gets into trouble.
Ae Ri is arrested as a kidnapper, and Seo Jin from the same timeline misunderstands her as a threat. Feeling frustrated, Ae Ri regrets the fact she gave it all to help Seo Jin. Not knowing this, Seo Jin refuses her request for leniency. However, his memories begin to surface.
Seo Jin struggles mentally and physically after what he considers a kidnapping attempt by Ae Ri. At the same time, Ae Ri questions herself whether she should continue to help Seo Jin. While both are on the verge of losing mutual trust, Hyun Chae goes through Seo Jin’s belongings.
Despite the misleading, discouraging happening with Seo Jin, Ae Ri admits that only Seo Jin can help her find her mother. At the memorial park, while Seo Jin is making a presentation regarding the Taejung New Town Project, Ae Ri runs into Seo Do Kyun, who later hears his own voice over Ae Ri’s phone call.
Seo Jin visits Taejung Town Collapse Victim’s Association. He finds out that his father is not the kind of person who would commit suicide and leave his son alone. He decides to investigate the collapse incident further for himself.
Ae Ri feels perplexed at Seo Jin’s unfamiliar reactions. She feels something fishy and tries to confirm that the person with the phone is Seo Jin. Hyun Chae also feels strange at Seo Jin’s different behavior.
