While investigating a serial murder case, Han Tae Joo gets into an incident. When he wakes up, he finds himself back in 1987. To get back to his present world, he must solve the murder case.
Lee Young-Joon's family runs a large company and he works as the vice-president of the company. He is smart, rich and handsome, but he is arrogant. His secretary is Kim Mi-So. She has worked for him for years and she is perfect for him, but Kim Mi-So decides to quit her job.
Nam Shin is a son from a family who runs a large company. After an unexpected accident, he falls into a coma. His mother Oh Ro-Ra is an authority on brain science and artificial intelligence. She creates an android named Nam Shin III which looks like just like her son Nam Shin. The android pretends to be Nam Shin and he has a bodyguard So-Bong.
Young-Hee lives alone at an apartment. She has separated from her pilot husband Sang-Jin, because he had an affair. Meanwhile, Jung-Hyo is pregnant, but her boyfriend wants her to have an abortion. Jung-Hyo goes to Young-Hee’s apartment and tells her she will stay there until she gives birth. Young-Hee is her boyfriend's mother. Living together, Young-Hee and Jung-Hyo fight with each other, but also come to understand each other.
Detective Kang Dong-Soo's fiance is killed mysteriously. He works with a female detective who can see 3 days into the future. She sketches what she sees. They set out to capture the murderer. Kim Do-Jin is a former special forces member. His pregnant wife was killed and he plots revenge.
Hoon-Nam knows about love theoretically, but he rejects falling in love. Jung-Eum wants to fall in love, but, due to her difficult situation, she gives up on finding love. Hoon-Nam and Jung-Eum meet and develop a relationship romantically.
Park Cha O Reum works as a rookie judge. She is in her mid-20's and follows "an eye for an eye" principle. She does not accept prejudice or blindly follow authority. Dealing with cases, she and her colleagues, including Im Ba-Reun, grow as persons.
Our heroine will have the unfortunate ability to see the “life clocks” of everyone around her, including herself, and the hero will somehow be able to stop her “time” without lifting a finger. This story will follow time that is stopped, extended, and even erased through the love they have for each other.
A man and a woman who are emotionally scarred due to a murder case that took place in their past has their fates intertwined. Together, they try to overcome the inevitable challenges that life throws at them.