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What do you call a woman who'd kill for you?
This is a one-shot I wrote for JaeSeulgi. Please read the tags and note that this is darker than the rest of the mastermind series
Series
- Part 3 of Mastermind AU
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Summary
Seulgi was just trying to do her job in peace—saving lives every day in the ER. She knew how to do that like the back of her hand, it was predictable.
That is, until Yoo Jaeyi arrived.
The infuriating flirtation from Jaeyi slowly turned into something more, something that Seulgi kept denying until she couldn't anymore.
And then, just when she thought things couldn't get more complicated, Jaeyi proposed a no-strings-attached relationship.
And Seulgi said yes.
Or, The A/B/O fanfiction literally no one asked for.
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Summary
Yoo Jaeyi’s peaceful life takes an unexpected turn when a friend’s colleague, Woo Seulgi, starts joining their weekend hangouts—with her three-year-old son, Leejin, in tow.
Three weeks after the new school year begins, Leejin ends up becoming one of Jaeyi’s students, proudly declaring that he already knows his teacher from “dinner nights.”
Soon, Jaeyi finds herself charmed by Seulgi’s calm warmth…and by Leejin, who’s absolutely convinced her name is “Teacher Woo.”
Between morning drop-offs, tiny hugs, and a toddler who might just be the world’s smallest matchmaker, something soft and steady begins to grow—a love that feels a lot like home.
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Summary
The name is Woo Seulgi.
Every Wednesday, a steaming cup of black coffee—no sugar—is ordered.
And every time, the order is never collected by themself.“Hot coffee for Woo Seulgi!”
Every Wednesday, I call it out.
And every Wednesday, I can’t help but wonder, quietly to myself,'Will today be the day Woo Seulgi comes to claim it?'
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Jaeyi doesn’t care for people. She never has. The only one who matters is her older sister, Seulgi, the only person she can’t stand to be without. To everyone else, their closeness looks ordinary, just sisters sharing an unbreakable bond. But beneath Jaeyi’s calm, cold exterior lies something sharper, darker, something that refuses to let go.
And Seulgi is no different. To her, Jaeyi is not just a younger sister but something more, someone she guards fiercely, someone she refuses to let slip into anyone else’s hands.
When someone dares to take Seulgi’s attention, Jaeyi makes sure they regret it. When someone dares to draw near Jaeyi, Seulgi’s jealousy burns just as violently. Because in the end, they both know the truth. Seulgi isn’t just Jaeyi’s world, and Jaeyi isn’t just Seulgi’s. They belong only to each other. And neither of them is about to share.
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Strawberry vape, or lollipops, just not roses by Hopihopia
Fandoms: 선의의 경쟁 | Friendly Rivalry (TV)
08 Oct 2025
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Summary
Something happened during winter break, and senior year starts off gut wrenching for Yeri and Kyung, especially since they had to work on a Romeo and Juliet play together, where Kyung is not playing Juliet.
Or
Friendly Rivalry: Fantasy of the Girls AU
- Language:
- English
- Words:
- 3,693
- Chapters:
- 1/1
- Kudos:
- 10
- Hits:
- 76
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Summary
You sit beside me, the perfect student, my best friend. But I see the shadows in your eyes, the distraction you think you’re hiding. You think your thoughts are dirty, something to be ashamed of. You have no idea.
I want your dirty. Your filthy. Your nasty. I want it all.
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Inspired by BIBI’s Scott and Zelda
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Seulgi has a habit of stealing Jaeyi’s things.
At this point, Jaeyi’s just charging interest. -
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Summary
Doctors Yoo Jaeyi, Woo Seulgi, Choi Kyung, Joo Yeri, Nam Byeongjin, and Cho Ara take a well-deserved three-day vacation at a resort, hoping to escape the stress of hospital life. But within those three days, friendships will be tested, jealousy will spark, and love will be pushed to its limits, turning what should’ve been a peaceful getaway into an unforgettable journey of emotions.
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Kyung never planned to call Yeri, but one late-night slip turns into a habit neither can break. Between Yeri’s idol training and Kyung’s law school grind, their stolen moments blur the lines between past and present. As long as Kyung keeps calling and Yeri keeps answering, their story is far from over.
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Midterms are hard. Being haunted by a pretty girl is harder.
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Jaeyi and Seulgi have been many things to each other: lovers, exes, and something too rare to name without diminishing it. Now, they’re co-stars. When Seulgi walks back into Seoul — and into Jaeyi’s life — after five years of silence, Jaeyi tells herself she’s moved on. She swears she isn’t in love with Seulgi anymore.
But the truth is tangled in more than old feelings: the ambitions of those around her, a father who will do anything to protect her, and the real reason that Seulgi left in the first place.
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Summary
Yoo Jaeyi, 2nd daughter of the Yoo conglomerate and future CEO, approaches her arranged marriage like a business deal, cold, distant, and strictly professional.
Woo Seulgi, heir to a wealthy family nearly as powerful, has no problem being married at all.
With a bright smile and a carefully calculated plan, Seulgi is determined to break through Jaeyi’s icy facade and make this marriage work, on her terms.
Or, The arranged marriage AU no one asked for.
Series
- Part 4 of In Every Universe, It’s You
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Daylights and Still Nights by jaeseulgifr (zyozyo)
Fandoms: 선의의 경쟁 | Friendly Rivalry (TV)
05 Oct 2025
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Summary
Before the world knew her name, Woo Seulgi was just a girl chasing auditions and chasing time—determined, exhausted, and always looking forward. Yoo Jaeyi was the only person who looked at her and never asked for more. She didn’t have to.
But Seulgi never noticed. Or maybe she did—just not enough to stay.
Years pass. Seulgi becomes a rising star, constantly bathed in light. Jaeyi stays quietly in the background, where she’s always been.
They grow up. They grow apart. But some ties don’t cut cleanly. Some feelings never needed names to last.
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Summary
Kyung is not good with words. Ye-ri is not good with feelings.
- Language:
- English
- Words:
- 911
- Chapters:
- 1/?
- Kudos:
- 7
- Hits:
- 51
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Summary
What seemed like love turned into papers signed in bitterness. And the truth lies buried beneath secrets, half-truths, and a betrayal.
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In this direct sequel to the events of "The Anomaly," the story picks up where the promise of a reunion left off. Fresh from her triumphant victory in the national exams, Woo Seul-gi’s first act is not to celebrate, but to embark on a pilgrimage to find Yoo Je-i, finally rekindling their fiercely obsessive love in a fragile seaside sanctuary. However, their peace is violently shattered by the early release of Je-i's monstrous father, Yoo Tae-jun, who is hell-bent on reclaiming his 'greatest creation' and the empire she helped destroy. What follows is an explosive and thrilling psychological war, as Tae-jun unleashes a relentless campaign using spies, digital ghosts, and brutal emotional manipulation, targeting their profound bond as their ultimate vulnerability. Forced from the shadows, Seul-gi and Je-i must assemble their own vanguard with Gyung and Ye-ri, plunging into a high-stakes game of cat and mouse filled with shocking betrayals and dangerous heists. Every moment is a battle for survival where their all-consuming devotion is their only true weapon, pushing them to the edge as they fight to dismantle his legacy and finally destroy him, before his twisted obsession drags them both into an inescapable darkness.
Series
- Part 2 of Friendly Rivalry Stories
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Summary
A continuation of Mastermind. This is a softer, fluffier, collection of one-shots exploring life in the Yoo household, following Seulgi, Jaeyi, and their two daughters, Minju and Yeona, as they navigate family.
Series
- Part 2 of Mastermind AU
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Summary
In 2023, a year after her passing, Woo Seulgi is still mourning the loss of her girlfriend, Sung Deoksun. She is somehow transported to 2002 into the body of 18-year-old Kim Soobin. That's how she meets Yoo Jaeyi, a girl who bears a striking resemblance to her dead girlfriend.
Seulgi finds herself navigating between two timelines, trying to figure out how much of her life is destiny and how much is free will.