A story where ten people get the chance to go back in time by one year, but unexpectedly mysterious situations start to arise when their fates are changed and twisted in the process. Ji Hyung Joo is a detective in the violent crimes division. He used to be part of the traffic police but was promoted when he arrested a wanted criminal. It's been seven years since the change, and he's a talented individual who always knows how to relax. Though he is happy at first to have the chance to go back in time by one year and "reset" his life, he begins to search for the truth when a series of mysterious events befall on the group of people he goes back in time with. Based on the Japanese novel, "Repeat"

Kwon Sang-Gon is a gangster who wants to have a cool life. He becomes a gang boss and expects to reap the rewards of the top position. Kwon Sang-Gon soon realizes his life is a living hell, filled with conspiracies and betrayals.

In order to live, a woman named Eun Han risks her life by going through a dangerous surgical procedure for a new face. However, due to the after-effects of surgery, she loses her memory. She tries to find the missing pieces of her memory and while suffering from a different face and not knowing about herself, Kang Woo appears in front of her. Kang Woo has been hurt as his lover left him. He suffers as his relationship with his father gets worse. Like they were destined, Eun Han and Kang Woo reunites. He becomes determined to help Eun Han find her memory. As they work together, Kang Woo slowly opens up his closed heart to Eun Han. Meanwhile, Chan Ki, the morning news anchor, lives a perfect life. However, he seems to have a dark side which no one would have ever imagined. This mystery melodrama takes people to unexpected places with unexpected people.