After a tragic car accident, 18-year-old Kang Gyung Joon discovers that his spirit has been transported to the body of 30-year-old Seo Yoon Jae. Yoon Jae is a successful doctor who is engaged to high school teacher Gil Da Ran. But Da Ran just so happens to be Gyung Joon’s teacher. What is a boy to do when he discovers that he has become his own teacher’s fiancé by a freak of nature? Will he be able to return to his own normal life or is he doomed to live out the older man’s instead?

The life of Go Eun Chan (Yoon Eun Hye) is not easy; she works many jobs to pay off debts and even gave up her feminine image. Choi Han Kyul (Gong Yoo) is the heir of a big food company, but his grandmother wants him to settle down, so she arranged many dates for him. After Eun Chan bumped into Han Kyul and was mistaken for a boy, Han Kyul decided to hire Eun Chan to be his gay lover in order to avoid the arranged dates. Desperately in need of money, Eun Chan had no choice but to accept. Han Kyul's grandmother also made Han Kyul in charge of a filthy coffee shop in danger of being bankrupt. Eun Chan begged to work at the coffee shop, and not long after, feelings start to spark, except, how would Han Kyul accept his "homosexuality"?

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After Seo Haneul (Sung Yuri) lost her mother in a fire, she was later adopted by a wealthy family and experienced a life of many twists and turns. Seo Gun's father had married an unwed mother, thus making Seo Haneul his sister in the eyes of the law. After their parents passed away, Seo Haneul was adopted by a wealthy chairman of a large organization who has also became a gangster. Upon using Haneul to extort money, Seo Gun and Haneul slowly fall in love with each other.

Na Bori (Gong Hyo Jin) is a 25 year old woman who desperately wants to be a teacher at the high school she was kicked out of due misunderstanding with her teachers over injuring a group of male classmates. After getting her GED, she rejects job offers from other high schools and works on becoming a teacher at her old high school so she could work side by side with her high school love interest, the art teacher Ji Hyun Woo (Kim Da Hyun). However, the only thing that enables her to get the coveted job is by signing a contract to essentially babysit Park Tae In (Gong Yoo), a troublemaker who attends the same high school. Tae In, a lonely youth, quickly becomes the "jjang", or "king" of the high school, and enjoys playing mean tricks on Bori whose easygoing personality attracts the majority of her students. Noh Jemma (Choi Yeo Jin) is jealous of the relationship between Bori and Tae In, and goes out of her way to get Bori kicked out but she's not the only one against them...