How to put up an advertisement for WJSN (Cosmic Girls) [2026 Edition]: Apply with Oshi-ado

Why WJSN (Cosmic Girls) Fans Choose Support Ads

WJSN (Cosmic Girls) is a 10-member K-Pop girl group that debuted on February 25, 2016, under Starship Entertainment. The current active members are EXY, Seola, Bona, Soobin, Luda, Dawon, Eunseo, Yeoreum, Dayoung, and Yeonjung. Their fandom name is "Ujung" (friendship), reflecting the fans' commitment to walk alongside the group.

Many fans want to show their support for WJSN, who will continue to be active in 2026 for their 10th anniversary, in a bigger way. "Support ads (Saengil ads)" are now gaining attention as a means to convey these feelings throughout the city.

What are Support Ads? The Basics WJSN Fans Should Know

Support ads (Saengil ads) are a fan culture where fans personally fund advertisements expressing their love for artists and display them in public spaces. Originating from "Saengil (생일) ads" in Korea, this practice has spread to Japan and can now be seen in various locations such as train stations, commercial facilities, and around live venues.

Types of Support Ads and Estimated Costs

Digital Signage (Most Recommended)

This involves displaying ads on large monitors installed in commercial facilities, around train stations, and in bustling downtown areas. They support both video and still images and are highly visible. Some media can accommodate placement in as little as a week, allowing for flexible responses to last-minute requests for anniversaries. The estimated cost is from approximately 30,000 yen, making it an accessible price range for individual fans.

Outdoor Vision

This involves displaying ads on large outdoor monitors in bustling areas like Shibuya, Shinjuku, and Umeda. These locations have high foot traffic, and there's an expectation for virality on social media. Costs vary depending on the size and location, but this option is suitable if you want to create an impactful support ad.

Ad Trucks

These are mobile advertisements where trucks equipped with large monitors巡回 the city. They can be focused on areas around concert venues and places where fans gather, making them a highly effective medium for appealing to Ujung.

Station Posters / Transit Ads

These are poster advertisements displayed within train stations. They tend to have a longer lead time for placement and higher costs. This type of media is often planned with funding collected through crowdfunding.

How to Create a Support Ad

Step 1: Determine Your Goal and Budget

Clarify who you want to celebrate (individual member or group), what you are celebrating (birthday, anniversary, concert success祈願, etc.), and when and where you want the ad to be displayed. If you're paying individually, a budget of 30,000 yen or more is a good starting point. If you're using a crowdfunding model where multiple fans share the cost, it's safest to set an upper limit before proceeding.

Step 2: Choose Your Media

Select the media based on the desired location, timing, and budget. Digital signage, with its short lead time, is popular as it can accommodate requests made close to a birthday. If aligning with a concert or event, consider signage or ad trucks around the venue.

Step 3: Prepare the Creative

Create the advertisement images/videos to be displayed. Most media outlets have specific requirements for size, resolution, and file format, so be sure to confirm these when applying.

Step 4: Check Agency Guidelines

Starship Entertainment, WJSN's agency, may have guidelines regarding fan-funded support ads. It's advisable to check their official website or fan cafe for the latest policies before applying.

Step 5: Apply and Complete

Once the media is finalized, fill out the application form with the necessary information and submit the creative data. After display, share photos on social media with other fans.

WJSN Member Birthday Calendar

• Seola: December 24
• EXY: November 6
• Bona: August 19
• Soobin: September 14
• Luda: March 6
• Dawon: April 16
• Eunseo: May 27
• Yeoreum: January 10
• Dayoung: May 14
• Yeonjung: August 3

The group's debut anniversary is February 25. As 2026 marks their 10th anniversary, it is expected that more fans will plan support ads to coincide with this milestone.

What is Oshi-Ad?

Oshi-Ad is a platform where individual fans can apply for support ads for their favorite artists, starting from approximately 30,000 yen. You can choose from various media, mainly digital signage, but also ad trucks and outdoor visions.

• Direct application by individuals: No need to form a corporate entity or executive committee; individual fans can apply in their own name.
• Placement in as little as 1 week: Some media have short lead times, allowing for applications even close to a birthday.
• Individual price range from approximately 30,000 yen: Since you can apply directly without going through large agencies, costs can be kept down.
• Built-in crowdfunding function: You can also raise funds through a crowdfunding model, with participation starting from 500 yen per share. The commission fee is 10%, which is among the lowest in the industry.
• Support for checking agency guidelines: If guidelines need to be checked before applying, you can receive support throughout the process.

Summary: Support WJSN with Oshi-Ad

Support ads for WJSN (Cosmic Girls) can be placed by individuals starting from approximately 30,000 yen. You can choose from various media, mainly digital signage, as well as ad trucks and outdoor visions, depending on your purpose and budget.

Ujung who want to express their feelings for their favorite artists should check Oshi-Ad for media options, dates, and cost estimates. Check app.oshi-ad.com