Actor Jang Dong Ju has caused an alarm among fans as he took to social media with a very sudden and cryptic apology.

On October 31, Jang took to Instagram and uploaded a black photo with a simple caption that said, "I'm sorry." It was not accompanied by any explanation, and this left several fans confused and concerned about the meaning of this photo. Koreaboo added that the update immediately went viral since it was so ambiguous.

A neutral observer called it "minimal but emotionally heavy," since the lack of context made fans more concerned.

Fans filled the comments section with concerned messages, most of them full of bewilderment and sympathy for the actor.

One fan wrote, "What's wrong? Is there something going wrong?" Another commented, "I am so worried...are you ok? What's happening?" Others echoed similar sentiments, one of them saying, "Oppa, what's wrong? Did you do something wrong?"

Through theqoo, community forums are having discussions, mirroring the concern on Instagram as netizens speculate on why such a post has been made. Some are speculating that the actor may be having a rough personal time and others are hoping it is just a misunderstanding.

Amid the growing public concern, a short response came from Jang's agency Nexus E&M. A representative said, "Oppa, what's wrong? Did you do something wrong?."

The agency's comment has shed little light, yet they are definitely corroborating the fact.

Since his debut in 2017 through School 2017, Jang Dong Ju has built a steady career in television and film. He is also preparing for his upcoming role in the SBS K-Drama "Human From Today," which will air in 2026.

Meanwhile, no other information has been given about the incident that caused Jang to apologize. Fans continue to keep their eyes on his account and are waiting for news from Nexus E&M.

His fans, and the entertainment industry, still hold onto the hope that he is safe and that the issues will be brought to the forefront shortly.