1 Six friends meet for a high school reunion, and it is time to go back to 1997. Shi Won sings an oldie at the karaoke in front of her parents. She can hardly believe it has been fifteen years since she and her friends swooned over every member of H.O.T.

2 A flashback to 1997 finds Shi Won handing her father a terrible report card — forty-eighth in a class of forty-eight. Those monkey-faced performers have done it this time: he tears the H.O.T. posters off her wall and threatens to adopt Yoon Jae instead.

3 Shi Won ventures to Seoul with the other H.O.T. devotees. One is missing: Yoo Jung, who has defected to Sechs Kies. Shi Won meets Tony at last, then comes home to a short, ragged haircut as punishment.

4 The Korea-Japan World Cup qualifier. Everyone gathers in front of the television and nobody, not even a roach, is outside — except that Shi Won forgot to order the fried chicken, so the whole room watches hungry.

5 Shi Won and her parents have a fender-bender, and her parents seize the chance to fake injuries in front of the other driver. They end up in hospital as a precaution, where her father is cleared of any accident injury and handed a startling diagnosis instead.

6 After surgery, Shi Won's father complains about his crowded hospital room and waits for the results. Shi Won gets into a fangirl brawl over the use of a classroom VCR — it starts innocently and turns serious enough that Yoon Jae is called out of a basketball game.

7 Shi Won's grades threaten to keep her out of university, so she writes fanfic instead and finds an audience. When a teacher humiliates her by reading a romantic H.O.T. fantasy of hers to the class, it wins her an invitation to a writing contest.

8 A countdown to two D-days. In the present, two hundred days until Tae Woong learns whether he will be president. In the past, one day until Yoon Jae plans to declare himself — with a puppy — to a Shi Won who is already taken.

9 Yoon Jae gives the puppy to a delighted Jun Hee instead, while Tae Woong, newly resigned from teaching, drifts around the house with nothing to do. Shi Won gets a fashionable and ridiculous new hairdo that her father offers to pay her to undo.

10 The group goes out to an underage nightclub, where Jun Hee performs a dance routine. It has Shi Won and Yoo Jung squealing, but Jun Hee is less interested in impressing girls than in impressing Yoon Jae.

11 Shi Won's parents leave for a cruise, unaware of her secret night job. Her father, sure that crime is rising, wants Yoon Jae to stay over. She refuses — until the night a stranger follows her home from work and Yoon Jae's line is busy.

12 Yoo Jung and Shi Won are trying on hair clips when Hak Chan walks past with Dan Ji. Shi Won insists he only has eyes for Yoo Jung, who marches outside to find out. Shi Won packs her H.O.T. posters for Seoul while Tae Woong buys a ring.

13 It is 2005. Yoon Jae is a successful judge, Tae Woong rich enough to consider going back to teaching, Yoo Jung teaches kindergarten, Hak Chan is studying film, Jun Hee is a medical intern and Sung Jae a civil servant. Where Shi Won is, nobody says.

14 Sung Jae gets a break from his job when Hak Chan and Yoo Jung take him hiking, and thanks Hak Chan for the video that made him so popular at work — Hawaii clearly taught him more than film. Shi Won, meanwhile, decides between Tae Woong and Yoon Jae.

15 Yoo Jung gets the surprise of her life when Hak Chan introduces her to his parents as his girlfriend. Shi Won causes a quarrel between the brothers, who both admit they love her; Tae Woong stands aside for Yoon Jae, on the condition that he gets his chance if Yoon Jae fails.

16 March 2013, and Shi Won's parents are pacing a hospital corridor waiting for news of their grandchild. When the doctor appears she has no news for them — only a question. Where, and who, is Shi Won's husband?