A high-achieving high school graduate, battles for justice at South Korea’s most reputable accounting firm.

At a difficult place in his marriage and career, a middle-aged man gets a shot at a do-over when he's transformed back into his 18-year-old body.

Cha Do Hyun is a rich heir to a family company with one major problem. Due to suppressed childhood trauma, he suffers from dissociative identity disorder manifested in 7 unique personalities who are out of his control. In order to overcome this disorder in secret, he hires a first year medical resident to help him heal by killing off each personality one by one.

Joo Joong-won is the arrogant, greedy CEO of Kingdom, a conglomerate that includes a supermall and a hotel. "Ghost whisperer” Tae Gong-shil, is a misunderstood outcast who can't keep a boyfriend or a job since a near death experience left her seeing needy ghosts. She feels compelled to help them resolve their earthly issues so they can move on to the afterlife... and he feels compelled to think she's crazy. Soon their lives merge into a complicated web of hijinx, misunderstandings, and... yes, love.

Top actor Ji Eun-ho hires ghostwriter Seo Jung-eun to write his autobiography. Eun-ho is tense, irritable and difficult to work with, but Jung-eun finds her assignment fascinating because Eun-ho claims he began acting not because he wanted to become a star but because he thought being in the limelight would help him find his first love, Ji Eun-dong. Eun-ho and Eun-dong's complicated romantic history has spanned two decades, and he's convinced that he can never love anyone else. As Jung-eun helps him remember Eun-dong and why he lost her, Eun-ho (whose birth name is Hyun Soo) looks back on his memories of her, from when he met when he was seventeen.