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Plot Summary

Sex Is Zero (2002) Plot Summary Explained

Release, runtime and language
2002 · 96 mins · Korean
Directed by
JK Youn
Starring
Im Chang-jung, Gi Ju-bong, Ha Ji-won, Choi Won-young, Lee Si-yeon, Shin Yi

Go Kids! Eun-sik tries to pass the state exam while studying in college after his military service. One day, he meets a beautiful woman Eun-hyo, and his life changes.

On this page (5)
  1. 1 What happens: full plot
  2. 2 Plot questions answered
  3. 3 Movie threads
  4. 4 Movies like Sex Is Zero
  5. 5 Every angle

Full plot summary · contains spoilers

What Happens in Sex Is Zero: Full Plot Summary

The whole story of Sex Is Zero (2002) explained, from the opening scene to the final frame: every key event, every twist and what it all adds up to. Read it as a quick recap before the sequel, to check a scene you missed, or to finally understand what really happened.

The plot centers on college student Eun-shik Im Chang-jung and his earnest, often awkward, efforts to win over his junior, Eun-hyo Ha Ji-won. After completing a mandatory two-year military service, he transfers to the National University with plans to study Law. He shares a cramped dorm with three roommates who are typical incoming freshmen, adding a sense of bustling campus life to his already self-conscious journey. Right from their first encounter, Eun-hyo’s presence shakes up his world, even as his own nerves tend to get the better of him. The movie follows how a series of clumsy, well-meaning gestures gradually pull them into a web of feelings neither fully understands at first.

Eun-hyo, an aspiring national aerobic athlete, first notices the quirky, sometimes lingeringly awkward attention from Eun-shik in the college canteen. He stares, almost absentmindedly, at her tightly clasped thighs visible under a short skirt, and she responds with a provocative, taunting display that catches him off guard. This awkward dynamic becomes the spark for a pattern of unintended closeness and misread signals, as they navigate the line between admiration and irritation in crowded halls and late-night conversations. Despite her initial sympathy for his one-sided crush, Eun-hyo ultimately becomes involved with another widely admired student, Sang-ok, who embodies a flashy confidence that appeals to her in the moment.

Sang-ok’s behavior complicates everything: he spends a night with Eun-hyo and leaves her with an unplanned pregnancy. True to his spoiled upbringing, he offers money to terminate the pregnancy and shows little remorse or responsibility. Shocked and insulted by his attitude, Eun-hyo feels betrayed and decides to take control of the situation, opting to pursue the abortion. Struggling with fear and uncertainty, she seeks support for what’s a deeply personal and painful choice, but the clinic’s request for someone to accompany her highlights how isolating the moment feels. Desperate for companionship, she turns to Eun-shik, who initially misreads the situation as a date but, moved by her vulnerability, chooses to stand by her side through the procedure and the long recovery that follows.

In the days after the abortion, Eun-shik becomes a steady presence: he cooks meals, tends to her post-operative fever, and offers quiet companionship as she processes the breakup with Sang-ok. He also helps her cope with the emotional aftermath, even as she wrestles with the sense of loss and confusion that accompanies such a life-altering sequence. The national aerobic competition looms large, and Eun-hyo fights through the exhaustion and heartbreak to step onto the stage with determination, delivering a performance that is both technically proficient and emotionally charged. The moment underscores her resolve to pursue excellence even amid personal pain, and it marks a turning point in how both characters confront their feelings.

After the performance, the fallout hits hard. Eun-hyo retreats to a restroom, where she cries and experiences a physical reminder of her abortion. Eun-shik discovers her missing and acts quickly, rushing her to the hospital to ensure she receives care. Consumed by a mix of anger and protective instinct, he locates Sang-ok in a post-competition celebration and confronts him with the truth of Eun-hyo’s tragedy, ending the confrontation with a punch that signals how deeply the events have affected him. The film closes on a tentative note: Eun-hyo is discharged from the hospital, and she asks whether Eun-shik’s feelings for her remain, leaving their future open to interpretation but rooted in the bond that formed through hardship, care, and the messy complexities of love.

Last updated: October 09, 2025 at 16:52

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Plot questions answered

Sex Is Zero Plot Explained: Your Questions Answered

The questions people ask most about Sex Is Zero (2002): what happens in the confusing scenes, why the characters do what they do, the twists, hidden details and what the ending means. Each answer contains spoilers.

Q1

Why does Eun-shik agree to accompany Eun-hyo to the abortion?

Eun-shik agrees because despite his awkward crush on Eun-hyo, he genuinely cares about her well-being. When the clinic requests a companion, Eun-hyo has no one else to turn to after Sang-ok abandons her. Eun-shik initially misreads the situation as a date but is moved by her vulnerability and chooses to stand by her, seeing an opportunity to support someone he cares about rather than abandon her in her darkest moment.

  • eun-shik
  • eun-hyo
  • abortion
  • support
  • care
Q2

Why does Eun-hyo choose Sang-ok over Eun-shik?

Sang-ok attracts Eun-hyo because he embodies flashy confidence and widespread admiration among students. His bold personality appeals to her in the moment, creating an exciting contrast to Eun-shik's more awkward and nervous demeanor. The summary indicates she becomes involved with him despite Eun-shik's obvious interest, suggesting she was drawn to Sang-ok's immediate charisma rather than Eun-shik's quieter, more earnest approach.

  • eun-hyo
  • sang-ok
  • relationship choice
  • attraction
Q3

How does Sang-ok react when Eun-hyo tells him about the pregnancy?

Sang-ok reacts with a spoiled, irresponsible attitude typical of his character. Instead of taking responsibility, he offers money to terminate the pregnancy and shows little remorse for the situation he caused. This response shocks and insults Eun-hyo, who feels betrayed by the man she trusted, leading her to distance herself from him completely.

  • sang-ok
  • pregnancy
  • money
  • responsibility
  • abortion offer
Q4

Why does Eun-hyo collapse after her aerobic performance?

Eun-hyo collapses due to both the physical exhaustion of competing while recovering from the abortion procedure and the overwhelming emotional weight of her recent experience. After delivering an emotionally charged performance at the national competition, she retreats to the restroom where she cries and experiences a physical reminder of the abortion, causing her body to give out from the combined stress.

Foreshadowing: The strain of training while recovering from the procedure was hinted at earlier when she fought through exhaustion and heartbreak to prepare for the competition.

  • eun-hyo
  • collapse
  • competition
  • abortion aftermath
  • physical breakdown
Q5

Why does Eun-shik confront and punch Sang-ok?

Eun-shik punches Sang-ok because he is consumed by anger and protective instinct after witnessing Eun-hyo's physical collapse and the emotional trauma she endured. When he discovers her missing and rushes her to the hospital, the full weight of what Sang-ok did hits him. He tracks down Sang-ok at a post-competition celebration and confronts him with the truth about Eun-hyo's tragedy, with the punch symbolizing how deeply the events have affected him and his inability to forgive Sang-ok's irresponsibility.

  • eun-shik
  • sang-ok
  • confrontation
  • punch
  • anger
  • protection
Q6

Why does the movie shift from comedy to serious topics?

The film intentionally transitions from a lighthearted, comedic first half depicting clumsy college romance to a more emotionally charged second half involving an unplanned pregnancy and abortion. This shift creates genuine emotional stakes while still maintaining the core story about Eun-shik's transformation from an awkward admirer to a genuinely supportive partner. The tonal change reflects the characters' growth and the real challenges they face together.

  • tone shift
  • comedy
  • drama
  • emotional arc
  • story development
Q7

How does Eun-hyo feel about Eun-shik by the end of the movie?

By the end, Eun-hyo's feelings for Eun-shik have evolved from initial irritation at his awkward attention to genuine appreciation for his unwavering support during her hardest moment. When she is discharged from the hospital and asks whether his feelings for her remain, it shows she now values him beyond just a friend. Their bond formed through hardship, care, and the messy complexities of love has developed into something meaningful, though the film leaves their future open to interpretation.

Foreshadowing: Eun-shik's consistent care during her recovery, cooking meals, tending to her fever, and offering quiet companionship, gradually shifted their relationship from awkward care to mutual reliance.

  • eun-hyo
  • eun-shik
  • feelings
  • relationship
  • ending
Q8

What does Eun-hyo's final question mean?

When Eun-hyo asks if Eun-shik's feelings for her remain after everything that happened, she is seeking reassurance about the authenticity of their connection. She wants to know if his support was genuine care or temporary pity driven by circumstance. The open-ended question suggests she has developed real feelings for him but is uncertain whether their bond can survive the trauma they shared, leaving their future relationship deliberately ambiguous.

  • eun-hyo
  • ending
  • question
  • future
  • relationship uncertainty
Q9

What happens during the abortion scene and why is it important?

The abortion scene shows Eun-hyo making a deeply personal choice after Sang-ok abandons her. When the clinic requires a companion, Eun-shik accompanies her through the procedure and the difficult recovery period. This moment becomes pivotal because it transforms their relationship from one-sided attraction into a partnership built on trust and care, demonstrating Eun-shik's true character beyond his awkward exterior.

Foreshadowing: The clinic's request for someone to accompany her highlights how isolating the moment feels, setting up Eun-shik's decision to step forward.

  • abortion
  • clinic
  • procedure
  • recovery
  • relationship turning point
Q10

How does Eun-shik change throughout the movie?

Eun-shik transforms from an awkward, nervous admirer who fumblingly tries to win over Eun-hyo into a genuinely supportive partner who stands by her during her most vulnerable moment. His journey moves from self-conscious crush to someone who prioritizes her well-being over his own feelings, demonstrating growth from a typical college student dealing with first-love nerves to someone capable of real emotional maturity and responsibility.

  • eun-shik
  • character growth
  • transformation
  • maturity
Q11

What impact does the abortion have on the story?

The abortion serves as the pivotal event that reshapes the entire narrative. It exposes Sang-ok's true character, forces Eun-hyo to confront both her personal crisis and her feelings, and becomes the catalyst that finally brings Eun-shik and Eun-hyo closer together through shared hardship. The experience tests everyone involved and ultimately determines the direction of the main characters' relationship, making it the emotional center of the film.

  • abortion
  • plot turning point
  • character relationships
  • consequences

Movie threads

More Movies Like Sex Is Zero, by Mood & Story

Curated lists built around what makes Sex Is Zero tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Funny and touching movies like Sex Is Zero

Films that start with laughter and evolve into surprisingly heartfelt journeys. Looking for movies like Sex Is Zero that mix comedy and romance with a sincere emotional core? This list features stories where humor and heart coexist, exploring themes of friendship and personal crisis with both laughter and tenderness.

  • humorous
  • tender
  • earnest
  • vulnerable
  • awkward
  • melancholic
  • Tone: bittersweet, humorous, tender
  • Pacing: steady, character-driven
Why these movies?

The story pattern: These stories often begin with a comedic or awkward setup, such as clumsy romance or situational humor, which serves as an entry point for more serious character development. The plot then pivots to address an emotional challenge, allowing characters to reveal unexpected depth and vulnerability.

Why they belong together: They are grouped by their shared tonal shift, balancing laugh-out-loud moments with authentic emotional weight, creating a bittersweet and empathetic viewing experience that feels both entertaining and meaningful.

College romance and drama movies like Sex Is Zero

Stories of clumsy love, friendship, and hard life lessons on campus. If you liked the college life and awkward romance in Sex Is Zero, explore these movies about young adults coming of age, dealing with unrequited love, friendship, and unexpected personal crises during their university years.

  • awkward
  • clumsy
  • earnest
  • vulnerable
  • melancholic
  • tender
  • Tone: bittersweet, earnest, melancholic
  • Pacing: steady
Why these movies?

The story pattern: The narrative follows young adults in a college setting, where initial pursuits of romance or social status are complicated by serious real-world issues. The journey is one of maturation, as characters learn to offer genuine support and confront complex emotional situations.

Why they belong together: They share a specific world (college) and a common emotional arc: the transition from naive, humorous antics to facing mature responsibilities, all set against the backdrop of campus life and formative relationships.

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Every angle

Sex Is Zero (2002) Explained: Plot, Timeline & Characters

Everything about Sex Is Zero in one place: what happens in the plot summary, the timeline in chronological order, the characters and meaning and a spoiler-free summary. What's After the Movie adds the cast, box office and post-credit scenes.

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