Fan & Star, a site that delivers idol ranking information, is holding a special event for Kim Dayeon on January 21st. It is a large advertising project to celebrate her birthday on March 2nd.

The success of Kim Dayeon's birthday project will be determined by the number of rainbow stars (points that can be collected on the site) donated by fans. The more stars there are, the more congratulatory advertisements will post 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.