Overview
- SM Entertainment announced the album Monday and opened preorders at online and offline retailers.
- The set features 10 tracks, led by the title song "Biggest Fan."
- A promotional image for the project was released through SM Entertainment.
- Irene launched her solo career in 2024, with first-week sales surpassing 330,000.
- The EP topped daily retail rankings on Hanteo and Circle, and reached No. 1 on iTunes in 23 regions and on QQ Music's digital album sales chart.