K-Musical Culture
26 AI Subtitle Glasses
Introduction
Musicals combine song, dance, and acting, allowing non-Korean audiences to engage with performances even when they do not fully understand the language. In recent years, international attendance at Korean productions has gradually increased.
Traditional Korean opera (Changgeuk) and certain Daehangno productions with relatively high proportions of foreign visitors have long offered surtitles. However, language barriers have continued to limit broader international audience expansion.
More recently, selected musical productions have begun introducing AI subtitle glasses as an experimental method of lowering language barriers and improving accessibility for non-Korean speakers.
1. Rental and Access
Subtitle glasses are available as an optional add-on service linked to a specific performance date. Reservations are made in advance through ticketing platforms such as NOL (Interpark), where the glasses appear alongside ticket options. The rental fee is approximately ₩15,000 per performance.
At the venue, patrons receive a complete set consisting of the subtitle glasses and a dedicated smartphone device. There is no need to download an application. An official ID is required as collateral when collecting the equipment.
This integrated rental model positions the system as an organized venue service rather than a personal app-based solution.
Subtitle glasses information page on the Charlotte Theatre website, displaying rental fee (15,000 KRW) and direct purchase links for specific productions.
Reservation interface on the NOL ticketing platform, where subtitle glasses can be booked in advance alongside the performance ticket.
2. Equipment and Optical Display Structure
The rental set includes the glasses, a paired smartphone, and a protective case. The devices connect via Bluetooth, with the smartphone functioning as the control interface.
Inside the lens, a green rectangular projection area is visible. This is not a background screen but part of the internal optical display system through which subtitle text is reflected into the viewer’s field of vision. The stage remains visible behind the overlay, allowing simultaneous viewing of performance and translation.
When used together with traditional opera glasses, however, the stage image may appear darker, while the projected subtitle text becomes comparatively more prominent due to differences in light transmission.
Subtitle glasses rental set including the dedicated smartphone controller and protective case.
Internal optical projection area visible inside the lens, where subtitle text is reflected in green.
3. Interface and System Operation
Before the performance begins, users select the relevant production from a list view interface. Multiple supported shows may appear within the same system, indicating a platform-based structure rather than a single-production setup.
Language options vary by production but may include English, Japanese, Simplified Chinese, and Traditional Chinese. Users can adjust subtitle position, font size, and screen brightness through the smartphone interface. The battery level of the glasses is also displayed, confirming that the device operates on an independent power source.
During the performance, subtitles appear as green text within the lens frame. The glasses allow basic on/off control, but detailed adjustments require use of the smartphone, which may be inconvenient once the performance has begun.
Main interface for selecting the performance and subtitle language before the show begins.
Pre-show subtitle configuration screen for positioning and text customization.
4. Translation Characteristics
The AI-generated subtitles were generally accurate in conveying semantic meaning. However, Korean frequently omits subjects and employs inversion or poetic compression in musical lyrics. These features were rendered into fully structured English sentences, sometimes expanding the text and reducing its rhythmic immediacy.
In practice, this resulted in translations that supported comprehension but did not always preserve the lyrical pacing of the original performance. Minor delays of approximately one to three seconds were occasionally noticeable, and certain ensemble or chorus passages were not consistently displayed.
The current system appears to prioritize semantic clarity over musical phrasing, reflecting an early-stage technological approach to live performance translation.
Despite these limitations, the system effectively supported comprehension and helped reduce language barriers for non-Korean audiences.
