Unassuming high school girl Jan-di stands up to — and eventually falls for — a spoiled rich kid who belongs to the school's most powerful clique.
Just being rich isn't enough to survive the teen tyranny at Shinhwa – outsiders or loners are often marked as targets by the bored über-clique F4.
A scandalous rumor is spread on the Internet that a second-year student at Shinhwa High School, identified as "Miss K," is pregnant.
Not keen to watch Jan-di dancing with one of his best friends, Jun-pyo leaves the ballroom and ends up taking out his frustrations by the poolside.
Making a sudden decision, Jan-di tells her mother she has to go somewhere and runs off, heading toward Namsan Tower.
Jan-di's bike is set on fire while she is assaulted with water balloons and blasted with a fire extinguisher.
A psychic predicts that Jan-di will be losing something important.
Jun-pyo plans to evict his best friend and Jan-di out of Shinhwa High School – and out of F4.
Jan-di rushes to the hospital after hearing that Jun-pyo has been in an accident.
Yi-jung receives a hysterical call from his mother threatening to commit suicide because of his father.
Valentine's Day reveals hidden feelings. With the family dry cleaning business in serious trouble, Jan-di decides to take a new job.
A note indicates that class has been moved to the science lab. The lab is empty, but Jan-di waits, not noticing that the room is filling with fumes.
Jan-di's father gets taken away by loan sharks, which inevitably forces Jan-di's mother to swallow her pride and beg Madam Kang for help.
The F4 guys have moved on to university, while Jan-di has entered her final year of high school. She has not heard from Jun-pyo since he left.
Jan-di waits to hear the results of F4's meeting with Jun-pyo, and can tell from their expressions that it was not good.
After treating Jan-di in a harsh manner, Mr. Jung prepares everything so that Jun-pyo can see her in Seoul. Can he go without Madam Kang finding out?
Jan-di's family hears about Jun-pyo's engagement and asks her dejectedly if it's true.
Ji-hoo can see how hurt Jan-di is by the kiss, and continues to follow her as she walks around in a daze.
Jun-pyo starts seeing Jae-kyung in a different way, like he's seeing her for the first time as a potential friend – or maybe a kindred spirit.
Woo-bin tries to talk some sense into Yi-jung, who is hell bent on drinking himself into oblivion.
At home, Jun-hee thinks back to how her mother interfered in her life, in much the same way she's interfering in Jun-pyo's now.
Yi-jung is happily waiting for Eun-jae, until he accidentally overhears her phone conversation, which sounds like she is talking to a boyfriend.
Jun-pyo pleads for Jan-di to tell him not to get married.
Jun-pyo tells Jan-di that he'll protect her, but to Jun-pyo's surprise, she says that she does not want to be protected or taken care of.
Feeling it's time to reveal the truth, Mr. Jung leads Jun-hee to the mystery patient's bedside, and at the sight of her father, Jun-hee breaks down.
Jun-pyo asks Yumi to make the lunchbox again, proving that Yumi had taken credit for the lunch that Jan-di had made for him.