Fan & Star, a site that delivers idol ranking information, holds a special event for Kim So-Jung (Sowon) on November 5th. It is a large advertising project to celebrate her birthday on December 7th.

The success of the Kim So-Jung (Sowon)  birthday project will be determined by the number of rainbow-specific (points that can be collected on the site) donated by fans. The more stars there are, the more congratulatory advertisements are posted in various places.

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