New Delhi, Nov. 10 -- South Korean K-pop star HyunA fainted during her performance at the Waterbomb festival in Macau, sparking concern among fans and across social media.

The singer, who has been open about her ongoing health struggles, later addressed the incident with a heartfelt apology to her supporters.

"I'm truly sorry. I wanted to show my best, but I feel that I was unprofessional. Honestly, I don't even remember anything. Many fans came all the way to Macau, and everyone paid to watch me. I'm really, really sorry. From now on, I'll work on building up my stamina and keep doing my best. From when I was very young until now, you've praised me, supported me, and loved me even though I'm lacking. Thank you for that. And I'm really ...