The idol weekly ranking site "Fan N Star" has been holding a surprise support event for TWICE Chaeyoung since February 4th. It is a global fan sentiment project in which advertisements celebrating her birthday it will be posted in various places.

Chaeyoung's birthday project will be confirmed to be successful by the number of rainbow stars (points that can be collected on the site) donated by fans. When more than 20,000 stars gather, congratulatory advertisements are held.

When the number of stars reaches 20,000, a congratulatory video will be screened on the CM board at Hapjeong Station on the Seoul Subway. When 55,000 stars gather, a congratulatory video will also be released on the Shinokubo electronic display in Shinjuku, Tokyo, Japan. In addition, ultra-high-end gifts such as Hongdae M Screen, Jamsil large digital electronic display, and Seoul bus advertisements are prepared.