BTOB fans are worried over Changsub's throat condition.

Sungjae had recently made a post on Instagram, and he had not muted the sound. In the background, fans heard Ilhoon talking to BTOB's staff, saying:

Ilhoon: Changsub-hyung's throat condition is really bad.
Staff: It's been like that for 3 days.

Staff 2: Vocal chord nodules happen.
Ilhoon: No, it's been like this for 7 years.

Fans are especially concerned because Changsub recently had to change his way of vocalizing because of vocal chord nodules. Changsub won't be singing for a bit because of his enlistment, but fans are still worried that he will have to use his throat anyway.

The video has been since deleted, and Sungjae has uploaded the clip again without any sound.