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© 2026 Fanprose

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    Title: The Secret Behind the Mirror
    Cover image
    PublishedApr 24, 2026
    UpdatedApr 24, 2026
    LengthSeries
    Wordcount4,212
    Rating
    Mature
    Genres
    Smut
    Group
    TWICENMIXX
    Pairings
    Jihyo x Male Reader
    Characters
    Sullyoon (NMIXX)Jihyo (TWICE)Male Reader
    Chapter 1

    Chapter 1: The Awakening

    Ongoing
    Child of the Sun6h ago

    How does a secret room fit into the JYP building, huh? Just to clarify: 3/4 of it was written by me, and then I used AI to flesh it out a bit.

    36

    It was a slightly rainy summer day. Outside the towering glass windows of the

    JYP Entertainment building, the rain was pattering monotonously against the

    panes, tracing jagged, liquid silver paths down the glass. The gloomy weather

    cast a muted, gray light over Seoul, but inside the grand dance studio, the

    atmosphere was entirely different.

    Sullyoon stepped quietly through the heavy double doors of the rehearsal room.

    Nineteen years old, with wide, expressive brown deer eyes that usually held a

    profound shyness, she moved with a timid grace. She was dressed comfortably for

    practice, swallowed in a light, grayish-blue, loose-fitting, sweatshirt-style

    pullover hoodie that draped perfectly over her slender frame. Beneath the

    oversized hoodie, dark gray charcoal leggings hugged her long legs tightly,

    emphasizing her fit, lithe dancer's physique.

    TWICE had been dancing in this exact room just an hour earlier. Sullyoon closed

    her eyes and inhaled deeply. The air conditioning was humming faintly, but the

    room still held the lingering ghost of their presence. It was an intoxicating,

    heady mixture of expensive, sweet floral perfumes, the sharp, raw tang of fresh

    sweat, and the faint, warm scent of heated skin.

    Sullyoon had come here to practice, but her mind was entirely elsewhere. For

    weeks, a scandalous whisper had been circulating through the darker, more

    private corners of the company. She had heard the rumors from Lia of ITZY during

    a late-night vocal session. The rumor was wild, impossible, and utterly

    scandalous: All the members of TWICE were secretly fucking the strict, imposing

    European bodyguard and dance trainer, Y/N.

    Y/N was a legend in the building. A thirty-year-old European powerhouse,

    standing an intimidating 188 centimeters tall and weighing a solid 90 kilograms

    of pure, sculpted muscle. He had short, sharp black hair and piercing brown eyes

    that missed absolutely nothing. He was notoriously strict, adhering rigidly to

    the rules, demanding perfection from the idols. He was almost always seen in a

    sleek, tailored black Adidas training suit, looking more like an untouchable

    enforcer than a lover. The idea that the untouchable, perfect members of TWICE

    were surrendering themselves to him was a thought that made Sullyoon’s heart

    pound against her small, A-cup chest.

    Lia had mentioned something else. A secret room. A hidden sanctuary right here

    in the dance studio.

    Sullyoon’s deer eyes flicked toward the massive, wall-to-wall mirror that

    spanned the entirety of the room. Normally, this mirror was simply a tool, a

    vast expanse of reflective glass where idols perfected their synchronization.

    But today, to Sullyoon’s hyper-aware senses, it looked like a fortress hiding a

    grand secret.

    She walked slowly toward the glass, her reflection growing larger. She reached

    out, her small fingers pressing against the cold, pristine surface. She walked

    along the length of it, pressing gently, feeling for any imperfection. Near the

    far corner, where the shadows gathered, she felt a slight give. A pressure

    mechanism.

    Her breath hitched in her throat. She pressed harder.

    With a soft, almost inaudible mechanical click, a seamless piece of the mirrored

    wall popped forward slightly, acting as a door without a handle. Sullyoon’s

    mouth fell open. Her trembling fingers gripped the edge of the glass, and she

    pulled it open just enough to slip through, instantly enveloped in an entirely

    different world.

    Continue reading

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    9 likes from TheReturnofTheBlueBird, DCH, kryphtot, aznghast, Bananas, gglo, PinkBlood, YujinnieWinter, and Seeunsoon.

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