On November 5, EPEX made their return with the group's second full-length album, 'Youth Chapter 2 : Youth Deficiency' featuring the title track "Universe."

According to the data released by Hanteo, the album recorded 133,908 units sold on the first day of its release, setting a new best for the group. 

The new album has become EPEX's highest-selling album in first-day sales on the platform, surpassing the number of copies of their sixth mini-album 'Prelude of Anxiety Chapter 2. 'Can We Surrender?'' accumulated, with around 130,000 album first-day sales.

'Youth Chapter 2 : Youth Deficiency' features eight new tracks: the title song "Universe," "My Girl," "낭만소녀 (1997)," "It is what it is," "Attosecond," "경이로운 일상 (Wonderful)," "잃어버린 것들에 대하여 (Closer)," and "Loner."