The idol weekly ranking site "Fan & Star" has been holding a surprise support event for Sandeul since January 21st of last month. It is a global fan sentiment project in which advertisements celebrating his birthday will post in various places.

Sandeul's birthday project will be confirmed successful by the number of rainbow-specific (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.