Boy band NexZ returned Monday with a playful but confident declaration of identity, unveiling its second EP, “Mmchk,” built around the group’s own rhythm and attitude. At a press showcase in Yongsan-gu, central Seoul, the seven-member act — Tomoya, Yu, Haru, Sogeon, Seita, Hyui and Yuki — introduced the album as its first release in six months, since “Beat-Boxer” in October 2025. “‘Mmchk’ reflects how we define ourselves — choosing our own standards and enjoying things in our own way rather than