Friendly Rivalry

One box. Everything you need to decide.

Meet the students, villains, and complicated figures of Chaehwa Girls’ High School.

Lee Hye-ri

Yoo Jae-yi

Lead

Chung Su-bin

Woo Seul-gi

Lead

Kang Hye-won

Joo Ye-ri

Lead

Oh Woo-ri

Choi Gyeong

Lead

Kim Tae-hun

Yoo Tae-joon

Villain

Chae Seo-eun

Jo Ah-ra

Supporting

Choi Young-jae

Nam Byeong-jin

Antagonist

Kim Sang-ji

Beom-soo

Supporting

Lee Won-jae

Woo Do-hyeok

Supporting

Yoo Jung-Rae

Homeroom Teacher

Supporting

Kang Jin-ah

Kwon Hee-yoon

Supporting

Ma Hyun-ji

Park Byeong-hui

Supporting

All 16 episodes — spoiler-light recaps for every chapter of Chaehwa’s most dangerous friendship.

EP 01

The New Girl

Feb 10, 2025 · U+ Mobile TV

Woo Seul-gi arrives at Chaehwa Girls’ High School as a transfer student and immediately stands out — not for the right reasons. The school runs on wealth and rank, and Seul-gi has neither. She crosses paths with Yoo Jae-yi, the top student who notices her with an unsettling, calculating interest. The episode quietly introduces the orphanage chapters of Seul-gi’s past and the unresolved mystery surrounding her father’s death.

EP 02

Chosen

Feb 10, 2025 · U+ Mobile TV

Jae-yi begins inserting herself into Seul-gi’s life with a warmth that feels deliberate — practised and precise. Seul-gi resists but finds herself drawn in despite her instincts. The episode establishes the social hierarchy of Chaehwa more fully, introducing Joo Ye-ri and Choi Kyung’s roles in the school’s pecking order and the first hints of the academic pressure that consumes every student.

EP 03

Cracking the Surface

Feb 17, 2025 · U+ Mobile TV

Academic pressure begins to fracture the school’s composed surface. Seul-gi struggles to navigate the exam culture while Jae-yi continues to manoeuvre situations to keep her close — engineering proximity with the precision of someone who does not believe in accidents. The first real cracks in Jae-yi’s polished exterior appear, and the illegal shortcuts circulating among students come into focus.

EP 04

The Dream

Feb 17, 2025 · U+ Mobile TV

A pivotal dream sequence — depicting an intimate moment between Jae-yi and Seul-gi — arrives and shifts the emotional register of the series. The GL undertones that had been building become impossible to ignore, sparking considerable audience debate. Separately, Seul-gi uncovers information suggesting that Jae-yi’s family may be connected to the circumstances of her father’s death. The friendship deepens even as suspicion quietly grows beneath it.

EP 05

The Committee

Feb 24, 2025 · U+ Mobile TV

The mystery of Seul-gi’s father — a former CSAT examination committee member who died under suspicious circumstances — moves to the foreground. Jae-yi’s father, Yoo Tae-joon, is revealed as a powerful and dangerous figure with connections to corrupt academic circles. Seul-gi begins investigating quietly, careful not to disrupt the fragile bond she has built with Jae-yi even as that bond becomes harder to trust.

EP 06

Old Friends

Feb 24, 2025 · U+ Mobile TV

Byeong-jin, Seul-gi’s old acquaintance from the orphanage, reappears and attempts to pull her into his illegal operations — a new pressure layered on top of everything already threatening to collapse. Meanwhile, Ye-ri’s competitive streak leads her into morally grey territory as she fights to protect her academic ranking. Jae-yi demonstrates her cunning by engineering a test of Seul-gi’s loyalty with the calm precision of someone who does this often.

EP 07

Pills and Performance

Mar 3, 2025 · U+ Mobile TV

Drug use among students to enhance exam performance becomes a more prominent subplot — a darkly credible portrait of how far elite academic culture can push people. Seul-gi grows increasingly suspicious of Jae-yi’s real motives, questioning whether their friendship was ever genuine or simply a long manipulation. Choi Kyung steps more actively into the drama as the episode raises the stakes for all four girls.

EP 08

Eyes That Say Too Much

Mar 3, 2025 · U+ Mobile TV

The emotional tension between Jae-yi and Seul-gi peaks — their dynamic oscillating sharply between genuine warmth and cold hostility in a way that becomes increasingly difficult to categorise. The look that passes between them in this episode becomes one of the most-discussed moments of the series. New revelations about Yoo Tae-joon’s corrupt influence in the CSAT committee point toward the conspiracy at the series’ core.

EP 09

Dangerous Territory

Mar 3, 2025 · U+ Mobile TV

A significant turning point as the story escalates beyond psychological tension into darker, more convoluted conspiracy territory. Medical malpractice and illicit surgeries among students enter the picture — a narrative gear-shift that divides audience opinion about where the series is headed. Seul-gi is placed in direct personal danger for the first time, raising the question of who she can actually trust.

EP 10

The Ring Expands

Mar 3, 2025 · U+ Mobile TV

The illegal operations around the exam — cheating rings, drugging schemes, and corrupt oversight — expand in scope, implicating more characters and revealing how deep the rot goes. Jae-yi’s façade continues to fracture as her genuine emotional attachment to Seul-gi conflicts with everything she has been trying to accomplish. Ye-ri and Kyung’s separate storylines converge unexpectedly, complicating the alliances between the four girls.

EP 11

What He Did

Mar 3, 2025 · U+ Mobile TV

Seul-gi uncovers deeper evidence directly linking Yoo Tae-joon to her father’s death, escalating the stakes of the investigation considerably. The friendship between the four girls fractures under mounting secrets and competing loyalties — the cracks are no longer hidden. Jae-yi’s younger sister Je-na is introduced as a significant figure, tied to family secrets that Jae-yi has clearly been carrying alone for a long time.

EP 12

Breaking Point

Mar 3, 2025 · U+ Mobile TV

Alliances fracture as the truth about Jae-yi’s feelings for Seul-gi becomes increasingly impossible to suppress. The medical subplot — unauthorised surgeries and pill-fuelled academic desperation — reaches a crisis point that forces several characters into decisions they cannot walk back. The episode ends with enough momentum to suggest the finale arc is going to push further than expected.

EP 13

The Net Closes

Mar 3, 2025 · U+ Mobile TV

Evidence against Yoo Tae-joon accumulates — his complicity in the deaths of CSAT committee members becoming harder to bury. Jae-yi and Seul-gi communicate in secret, passing notes in class while under surveillance from Jae-yi’s father — a tense, quietly charged detail that crystallises the danger both girls now occupy. The pacing accelerates significantly as the series enters its final stretch.

EP 14

Jae-yi’s Plan

Mar 3, 2025 · U+ Mobile TV

Jae-yi formulates a bold and dangerous plan to expose her father publicly and protect Seul-gi — a move that requires sacrificing the protections she has always operated behind. Authorities begin closing in on Yoo Tae-joon’s network. Emotional scenes between the four female leads force a reckoning with the cost of surviving in a system designed to crush everyone who doesn’t already hold the power.

EP 15

No Way Back

Mar 6, 2025 · U+ Mobile TV

Jae-yi’s plan to dismantle her father moves into its execution phase, placing her in extreme and irreversible personal danger. Seul-gi, Ye-ri, and Kyung each face the consequences of the chaos surrounding Yoo Tae-joon’s imminent exposure. The episode ends on a cliffhanger as Jae-yi takes a drastic step — one that cannot be undone — setting the stage for a finale that goes somewhere most viewers will not see coming.

EP 16

Perfect Score

Mar 6, 2025 · U+ Mobile TV

The CSAT results are announced. Jae-yi has achieved a perfect score — unprecedented in Korean history — and the media attention it draws becomes the weapon she needs. What follows is the most dramatic act of the series, one that exposes Yoo Tae-joon in front of the cameras and strips away everything that has protected him. Six months later, justice arrives — but Jae-yi’s fate remains officially unresolved, and a mysterious package for Seul-gi suggests the story is not finished yet.

Full spoilers ahead — everything that happens in the finale and what it all means.

The exam as a weapon. Jae-yi’s endgame was never about the CSAT — it was about using the CSAT as a weapon against the man who corrupted it. When results are announced and she has achieved a perfect score — a genuinely unprecedented result in Korean history — the media swarm is immediate. Yoo Tae-joon’s world runs on obscurity and silence. Jae-yi has just put a spotlight on him that he cannot control or extinguish.

The jump. Jae-yi appears on live television alongside her younger sister Je-na and the two of them jump into the freezing sea — a theatrical act of public humiliation designed to force Yoo Tae-joon’s crimes in front of cameras and investigators simultaneously. Police rescue Je-na. Jae-yi’s body is never recovered. The show refuses to confirm whether she is alive, leaving her fate as a deliberately open wound. It is the kind of ending that infuriates and fascinates in equal measure.

What justice looks like. Six months later, the consequences land. Yoo Tae-joon is repeatedly called in to identify unrecovered bodies — a haunting detail that suggests he is being made to live with what he caused. The photographic and video evidence of his crimes, including his involvement in the deaths of CSAT committee members, is publicly released. He is taken in for criminal investigation. The system that protected him has turned on him, finally.

The box. Seul-gi receives a mysterious package believed to be from Jae-yi. The contents suggest she may still be alive and waiting somewhere — but the show never confirms it. Season 2 has been confirmed, and this ambiguity is clearly by design. Whether Jae-yi survived or Seul-gi is simply holding onto the last thing Jae-yi left her is a question the series refuses to answer and probably intended to carry forward.

What the ending is really about. Friendly Rivalry was always, at its core, a story about two girls shaped by systems designed to use them. Seul-gi by poverty and loss; Jae-yi by wealth and a father who treated power as currency and people as instruments. The ending does not give either of them peace — it gives them something harder and more complicated: the possibility of what comes after survival. Whether Jae-yi is dead or waiting, what the show leaves behind is the image of two girls who chose each other in a world that gave them every reason not to.