Their label, WF Entertainment, released a statement saying that Laun would be “halting all activities” with the group due to “personal reasons,” and that his contract has been terminated. The message closed with good wishes for both Laun and the remaining members of ONF.

Upset fans took to twitter using the hashtag #ThankyouLaun to express their adoration for the K-pop idol and offer their support.

The band—which is divided into two subgroups, ON and OFF—had been in the process of staging a fall comeback and released a series of teaser videos last week. Shortly after the announcement of Laun’s departure, OFF subgroup leader J-Us shared a message fans of the group (affectionately known as “Fuse”), expressing the wide range of emotions both the fans and band members are feeling.

— ig.dzarina_a.m.s (@dzarina_ams) August 23, 2019

“After finding out the sudden news of Laun’s departure, we are all puzzled and unsure of what to do for the time being,” J-Us wrote. “However, I’m writing this post because I think that Fuse, even more so than us, must be feeling hurt, upset, and worried.”

The OFF leader closed by writing “I think we’re still too young to accept all of this as though it’s all okay, and it’s difficult, but we want to overcome these difficult moments and show Fuse how we’ve matured. With our comeback coming up, our ONF members are going to gather strength and try to show you a good image so that people aren’t worried.”