What makes Inside (BtoB 4U EP) by BtoB 4U notable?

The EP received positive reviews for its mature sound and production quality, marking BtoB 4U's successful transition into sub-unit work. It also charted well on various music platforms, solidifying their presence in the K-pop industry during a competitive year. Released in 2020, 'Inside' is BtoB 4U's debut EP, marking a new chapter for the group after their previous activities as a full ensemble. This project allowed members to explore their individual artistry while still maintaining the essence of BtoB's sound, especially following their extended hiatus due to military enlistments.