Baek Ho-rang is a high school student. Due to her pretty appearance, she is popular on social media and at her school. Yet, Baek Ho-rang only has one friend, due to her condescending personality. Baek Ho-rang encounters a problem. She learns that someone is trying to unveil her secret. To find that anonymous person, Baek Ho-rang joins her high school's broadcasting club. Go Eun-taek is the chief of the broadcasting club. He is a perfectionist and respected by the club members.

Yoon Jong-Woo is a man in his 20's. He has lived in a small town for all of his life, but he gets a job at a small office in Seoul. Yoon Jong-Woo moves out to Seoul and stays at a cheap apartment which shares its kitchen and bathroom with other residents. He doesn't like staying at the apartment and he doesn't like the other residents who seem weird and suspicious.

Lee Ahn has the ability to read a person's secrets as soon as he touches them. He meets a woman who has secrets that she desperately tries to hide. The two team up to bring down criminals.

Cha Eun Ho is a genius writer and the youngest chief editor ever at his publishing company. He is smart and handsome. He is also even tempered at work, but he has a warm heart and a reasonable personality. Kang Da Ni used to be a popular copywriter, but she is not anymore. She is now broke and unemployed. Even though she tries to find a job, due to her impressive career and excellent educational background, she is unable to find a new job. Finally, Kang Da Ni gets a job at a publishing company by lying about her background. Cha Eun Ho is the chief editor at that publishing company. They begin to develop romantic feelings for each other.

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.