Rainz' Seo Sung Hyuk assured fans that he's okay after he collapsed due to fatigue on October 5.

SEE ALSO: A Blind user explains the detailed timeline of Min Hee Jin's time with Source Music and ADOR and her dispute with Bang Si Hyuk

Seo Sung Hyuk suddenly fainted during rehearsals preparing for the 'Produce 101' project group's debut, and it seems practicing and starring in the web drama '3AM in the Morning 2' was too much for him. Rainz officially stated he had no issues with his overall health and that their debut would not be affected, and now Seo Sung Hyuk has spoken up on Instagram.

He shared a smiling photo along with the message, "Hello to all our Rainzers. This is Rainz' youngest member Seo Sung Hyuk. You were all surprised by the news of my sudden trip to the emergency room, right? I was treated, and luckily, I've been a lot better. I'm out of the hospital and currently resting. Don't worry too much because I'm fine, and Rainz' schedule and live event will go on as planned! Our mini live event is coming up, and I can't wait to meet you guys. Please look forward to it."

Rainz are dropping their debut mini album 'mini album 'Sunshine' on October 12, which is the same day as their 'Rainz Shower'  mini live event.