TV series
The story of us who never learned how to lose.
A high-teen mystery thriller about a close relationship between teenage girls in a harsher survival competition than entrance examinations.
See where to watchStreaming, rental and purchase options
Checked Jul 22, 2026
A high-teen mystery thriller about a close relationship between teenage girls in a harsher survival competition than entrance examinations.
Cast, crew and production details
Lee Hye-riYoo Je-yi
Chung Su-binWoo Seul-gi
Kang Hye-wonJoo Ye-ri
Oh Woo-riChoi Gyeong
Kim Tae-hunYoo Tae-joon
Chae Seo-eunJo Ah-ra
Choi Young-jaeNam Byeong-jin
Kim Sang-jiBeom-soo
U+ Mobile TVSouth Korea
YLABSouth Korea
STUDIO X+USouth KoreaWatch options above are for the show and may vary by season or episode.
Episode 1
After living in a orphanage, Woo Seul-gi transfers to a top-ranking school hoping to find her father - and soon catches the eye of a popular student.
Guest stars Lee Eun-ju, Son Young-soon, Park Seong-gyoon
Where to watch Friendly Rivalry
Episode 2
Facing a heartbreaking discovery, Seul-gi struggles to adjust to her demanding schoolwork, while her background makes her a target of bullyng.
Where to watch Friendly Rivalry
Episode 3
Yu Je-i continues to show kindness towards Seul-gi and invites her to her private study space, drawing the two girls closer together.
Guest stars Oh Eun-seo, Gi So-you
Where to watch Friendly Rivalry
Episode 4
A furious Choi Gyung becomes suspicious when Je-i nominates Seul-gi as class monitor. Ju Ye-ri overhears a conversation about Je-i's former seatmate.
Where to watch Friendly Rivalry
Episode 5
While Seul-gi finds details of her family history on Je-i's phone, Choi Gyung looks into the connection between the two girls'past.
Where to watch Friendly Rivalry
Episode 6
Students take drastic measures to beat the stress of midterms. Choi Gyung shares a discovery with Seul-gi, causing them to question Je-i's intentions.
Guest stars Moon Ki-young
Where to watch Friendly Rivalry
Episode 7
Ye-ri makes a deal with Je-i's father, Yu Tae-jun, by using his secret against him. Seul-gi worries about a healt checkup following her exams.
Where to watch Friendly Rivalry
Episode 8
Ye-ri steals Seul-gi's father's phone. As she tries to unlock it, the rest of the students head to the school festival.
Where to watch Friendly Rivalry
Episode 9
An attack at the festival causes panic at the school. Je-i comes to face with a figure from her past as they fight over the stolen cellphone.
Guest stars Gi So-you, Lee Seol-ah, Yoon Chae-na
Where to watch Friendly Rivalry
Episode 10
As the police investigate the school's drug problem, Seul-gi comes under suspicion. Je-i makes a deal while seeking to help Seul-gi.
Where to watch Friendly Rivalry
Episode 11
Struggling to find Yu Je-na, Je-i decides to frame her for dealing, hoping the police will be able to locate her before their father does.
Where to watch Friendly Rivalry
Episode 12
A traumatic discovery leaves Je-i in a vulnerable state. Feeling uncertain over the situation, a suspicious Seul-gi looks for answers.
Where to watch Friendly Rivalry
Episode 13
While attending a funeral, Seul-gi suspects foul play. Her search foe evidence leads to a grim connection between her father and Tae-jun.
Guest stars Yoon Woo-ri
Where to watch Friendly Rivalry
Episode 14
With the help of Seul-gi, Je-i uses hidden cameras to spy on her parents, hoping to find a witness who can assist with the court case.
Where to watch Friendly Rivalry
Episode 15
Je-i and Seul-gi take drastic steps when their ranks slide after a big test. Byeong-jin pressures Choi Gyung into taking pills to maintain her grades.
Where to watch Friendly Rivalry
Episode 16
Leading up to the exam, Je-i and Seul-gi craft a final, defiant plan - but there are high risks for everyone involved.
Where to watch Friendly RivalryEpisode information updated Jul 22, 2026
More shows like Friendly Rivalry.
