Fan N Star, a site that delivers idol ranking information, started holding a special event for Cha Hun on June 10th. It's a big advertising project to celebrate his birthday on July 12th.

The success of Cha Hun's birthday project is determined by the number of rainbow stars (points that can be collected on the site) donated by fans. The more stars gather the more congratulatory advertisements are posted in various places.

When 20,000 stars are gathered, a congratulatory video will be shown on the CM board (square pillar) of Hapjeong Station on the Seoul Subway. When the number of stars reaches 55,000, a congratulatory video will also be posted on the Shin-Okubo electronic display board in Shinjuku, Tokyo. In addition, abundant gifts such as Jamsil's large digital electronic display boards, Hongdae M-screen, and Seoul bus advertisements are waiting for fans.