Eunil

On July 21, 2021, Interpark announced that they had established a subsidiary label, Interpark Music Plus, for their idol group production business. It was also revealed that the label is preparing to launch a new male idol group within the year. On August 10, Eunil, along with fellow members Yechan and Leon, were revealed as the second group of trainees.

On December 2, a new profile photo and film were released for Eunil. They made their debut with the mini album, Blue Set Chapter 1. Tracks, on January 5, 2022.