On January 3, 2024, IST Entertainment revealed its upcoming auditions via official social media accounts. Six days later, applications opened for the agency's global auditions. Through an Instagram account called 00d00m00y, they have revealed some trainees identified only by initials, starting with T and S on February 22, followed by M on March 1, B on May 28, H (Ki Hyeong Jun; former MAKE MATE 1 contestant) on August 22, SS seven days later, P on August 31, besides TF and N on December 5 and 6, 2024.
On September 23, 2024, IST Entertainment announced the "WHO'S 1ST Audition", with applications open from that date until October 18, to all genders and without nationality restrictions. On September 30, October 7, and 12, promotional photos of B, T, and S for this project were released, respectively. Their Instagram account was reactivated on November 4, 2024, however Ki Hyeong Jun's photos and videos were deleted, indicating his possible departure.
On January 3, 2025, new auditions to form the agency's new boy group were announced. On January 10 and 18, 2025, W and J were revealed as trainees. In June 2025, the group's account was deactivated and replaced with another named 0V__X0.
The newly revealed trainees have no names and are identified only by emojis instead of letters. On January 15, 2026, it was announced that IST Entertainment would be debuting a seven-member boy group called TUNEXX. They also confirmed former Boys II Planet contestants Sihwan, Donggyu, Arctic and Inhu as members of the group.
On February 2, 2026, the line-up was officially revealed: Donggyu, Inhu, Taira, Sungjun, Zeon, Sihwan, and Arctic, along with confirmation that the group is preparing for a full-fledged early March debut. On February 4, 2026, TUNEXX released a timetable revealing that they will be debuting with their first mini album Set By Us Only on March 3.
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