The hair brush wrapped in Wonyoung's world

A cherry color that hovers between pink and red, sweet enough to stop a thumb mid-scroll. The FOREVER:CHERRY project, built around IVE's Jang Wonyoung, has joined hands with medicube, a global dermacosmetic brand from Korea, for its first collaborative product.

The Ribbon Cherry Glass Hair Brush launched in Japan on May 11, 2026, priced at 2,970 yen including tax, with early sales on Qoo10. The piece below walks through the product and design first, then turns to the project that sits behind it, and closes with a few notes worth considering before purchase.

The product, at a glance

The Ribbon Cherry Glass Hair Brush is built around a simple idea: every stroke should leave hair looking glass-like. The phrase "GLASS HAIR" in its English name borrows from a Korean beauty term — glass hair, where the cuticle lies flat enough to catch and reflect light evenly. Read it as the hair equivalent of glass skin in skincare.

Priced just under 3,000 yen, the brush reads as quietly accessible to anyone already familiar with medicube's beauty devices. Sitting in the daily-tool price range rather than the high-tech-device tier reveals the intent: bring the FOREVER:CHERRY world into reach through an everyday object first.

Inside the bristle design

The visuals invite the gaze, but the bristle area is what matters in a hair brush.

At its core sits a four-tier pin structure, with each length playing a distinct role. The longest pins catch and loosen tangles first, the medium pins align the hair flow, the short pins smooth the cuticle along the surface, and the shortest micro pins gather and finish even the finest strands. A single brushing pass completes several steps at once — a quietly efficient approach typical of recent Korean hair care.

The graduated pin structure reduces the pulling force on hair, which is a small but real benefit. Long hair, high-tone color, and bleached ends are particularly vulnerable to breakage during brushing itself. The "doesn't snag" quality of a daily tool reads as understated, yet it shapes hair condition over the long term.

A glass-like sheen tends to come less from a special ingredient or coating, and more from cuticles lying flat with reduced surface friction. The pin structure and cushioned base on this brush are calibrated to limit friction and static during brushing — a subtractive design that lets the hair's own shine come through, rather than adding gloss on top.

The look on the vanity

A sculpted ribbon handle, a pink-to-rose gradient, and a large bow tied at the top. Placed on a vanity, it shifts the air of the room with a single object.

Beauty tools are increasingly treated as objects to display, the way perfume bottles and skincare jars have settled into daily interiors. The coquette mood that FOREVER:CHERRY leans into fits neatly into that context. A brush that functions as a fan keepsake, a daily care tool, and an interior object at once is uncommon.

The FOREVER:CHERRY project

With the design and engineering laid out, the project behind them is worth introducing. FOREVER:CHERRY began as an Instagram teaser in January 2025 and gathered over thirty thousand followers within hours of opening. While early speculation framed it as a solo brand launch by Wonyoung, her agency STARSHIP has stated officially that it is "a brand collaboration project, not Wonyoung's personal business."

That positions the project not as an artist-owned brand, but as Wonyoung's worldview formalized as a project and brought to life through medicube. The key phrase, "Defined by none, forever young," reaches for something that resists definition and stays fresh — a sentiment carried by the saturated red and pink that anchors the visuals.

The distance between an artist's personal brand and a brand-led collaboration that borrows the same worldview is small, but worth noticing. Knowing the latter shape helps keep evaluation steady when picking up the product itself.

Who it suits

• Those looking to lift shine and surface smoothness in daily hair care
• Those with long hair or color-treated strands prone to tangling and breakage
• Those who prefer to consolidate multiple brushes into a single tool
• Those drawn to IVE, Jang Wonyoung, or the broader coquette mood
• Those who treat their daily tools as objects, kept visible on the vanity

Notes before purchase

1. Buy through official channels. medicube Japan has announced early sales on Qoo10, with launch coupons and a two-pack promotion. Collaboration items often draw lookalikes and resold inventory, so the official site or its announced channels remain the safest entry point.
2. Watch stock and restock updates. High-visibility collaborations frequently sell out of the initial run. Restock schedules are typically posted to medicube Japan's official social channels (X and Instagram), so following them is a reliable way to catch updates.
3. Read resale prices carefully. Listings above the 2,970-yen retail price have already appeared on marketplace platforms. Scarcity tends to push prices up, but the brush remains a daily-use object. Setting a personal ceiling between collaboration value and everyday utility is worth doing before browsing.