Do you think running a support ad in Korea always requires a big budget?
In fact, for overseas fans or startup brands with limited budgets who want a short-term campaign, there is a highly cost-effective and popular option — CM Board (subway pillar digital advertising).
In this guide, we will introduce this extremely popular Korean advertising medium in full, so you can deliver high-value exposure for your idol or brand on a budget.
What is CM Board?
CM Board is a high-definition digital pillar screen installed in prime locations inside Seoul subway stations.
It overcomes the limitations of traditional lightbox posters, which require expensive printing and are typically only available for long-term placements. With dynamic rotation playback, it is currently the most popular advertising medium for low-budget support ads in Korea.
Coverage| Seoul Subway Lines 5, 6, 7, and 8
Prime stations| 21 high-traffic stations, including Hapjeong, Konkuk Univ. Entrance, Jamsil, Nonhyeon, Yeouido, Gangnam-gu Office, and more
Playback hours| Daily 05:00 – 01:00 the next day (up to 20 hours of extended exposure)
Frequency & length| Each ad 20 seconds / double-sided rotation over 120 times per day
Display| Synchronized playback on dual-sided screens (no audio output supported)
💡 In addition to dynamic digital screens, those with a higher budget can also choose CM Board’s physical lightbox ads.
Why do overseas fans and brands love CM Board?
1. Flexible scheduling, with a minimum of just 15 days
Traditional subway advertising is typically sold in one-month units. However, CM Board can be placed for as little as 15 days, making it an ideal fit for idol birthdays, debut anniversaries, short comeback cycles, or brand pop-up campaigns.
2. Prime foot traffic, double-sided synchronized impact
CM Board is typically installed near fare gates, transfer corridors, or key entrances/exits. With a large vertical pillar design and synchronized playback on both sides using the same creative, it delivers a strong presence no matter which direction pedestrians approach from—effectively doubling exposure.
3. Supports two formats, with a low production barrier
You may choose to run either static images or motion video. For first-time advertisers, image files are simple and smooth to produce; for those seeking stronger visual impact, high-definition video can showcase more details perfectly.
4. Highly competitive pricing
Compared with ultra-large LED walls at top-tier hotspots such as Hongdae and Gangnam, CM Board enables placement in similarly high-traffic prime areas nearby with a more accessible budget—delivering truly low cost and high return.
How can you place a Korea CM Board campaign from Hong Kong/overseas?
If you want your idol or brand to shine on the streets of Seoul, you do not need to worry about language barriers, not having a Korean bank account, or complicated approval procedures.
The Yonniverse team provides a one-stop agency service:
- Recommend the most suitable stations based on your budget and needs
- Provide end-to-end support for creative approval and schedule coordination with Korean media owners
- Provide on-site photo updates after the ad goes live
Whether you would like to check the most relevant availability, get a real-time quote, or learn the specific locations available, please feel free to contact us anytime via Instagram DM (@yonniverse) or email yonniverse.l@gmail.com. Let us help you deliver your message to Korea with precision.
