[2] June (under the name Jun Uehara) competed on South Korea's Mnet reality-survival program Produce X 101 and finished in 91st place.
However, the three former HALO members had left the show prior to its finale, citing personal reasons.
[4] June, along with individual trainees Tomoaki Ando, Shunya Osawa, and Yugo Miyajima were eliminated in the show's finale and finished in 20th, 14th, 13th, and 12th place, respectively.
[5] Beginning on February 1, the group and its members were announced daily through a series of individual profile videos.
[7] The lead track "Universe" was pre-released digitally on October 16[8] and the music video was released on November 1.