EION.

EION (이온) is a South Korean pre-debut boy group managed by Wannabe Entertainment, featuring 4 members: Sihoon, Haru, Minjae, and Hyun. The act was first presented in September 2025, as 5 The known members are Heemin, Teo, Sihoon, Haru, and Hwiseong. Additional background says that However, it was revealed on September 22, 2025, that Hwiseong was no longer part of the group. The profile also notes that The group began pre-debut Japan promotions on October 30, 2025, as 4 members. Another profile detail is that The group has since then undergone several lineup changes. Additional background says that The group is set to make their official debut in April 2026. The profile also notes that they are currently holding auditions to select additional members.