The story begins with the tale of a classic Korean story of romance about a princess named Pyun-gang whose husband, On-dal dies. Then we flash forward to a mother who has brought her haunted daughter (also named Pyun-gang) to a psychic, who informs her that her daughter is haunted by the ghost of the princess . He then goes on to say that the girl must marry her On-dal by her 16 birthday and produce a child within a year otherwise she will die. The family treats it skeptically until years later, Pyun-gang has several near-death experiences and is immediately spooked, convinced she is going to die. As luck would have it, soon thereafter, a new transfer student joins Pyun-gang's class. His name is On-dal, and he's intelligent, handsome and rich which really doesn't make the prospect of high school marriage such a tough deal for Pyun-gang, what with her impending death and all.

First story. Ye-jin is a high school junior from a wealthy family who also does very well in school. But her secret aspiration is to be a back dancer. Although her boyfriend Sang-rok is the class president and a good student, he is very passive. Ye-jin gives up her dreams of back dancing and decides to leave for Canada. Before she does, she gives Sang-rok a farewell kiss. Jun-tae is a problem student with a heart of gold. He quits school for good after he gets into a fight with the Dae-gon the top student at school. Second story. Jun-tae becomes a street kid hustling customers for a local bar. He develops a crush on a fellow street kid named Gigi. Jong-su, born poor and illegitimate, carries a giant chip on his shoulder. He is part of a motorcycle gang and is going out with Titi who works at the local gas station. The two couples take off to the East Sea for a getaway but are tracked down by men sent by Jong-su's father.

First generation K-pop boy group Sechskies look back on their 18 years as a K-pop idols and prepare for their 20-year anniversary.