The SBS show "My Little Old Boy" shocked viewers when actor Lee Dong-gun was diagnosed with a rare disease, revealing red eyes and excruciating pain. We've compiled the name, symptoms, and causes of the disease, along with viewer reactions.

1. Lee Dong-gun confesses to being diagnosed with a rare disease on "My Little Old Boy."

In the preview for SBS's 'My Little Old Boy', which aired on September 21, 2025, a scene was revealed where actor Lee Dong-gun visits a hospital. In the screen, he is seen on one side. His eyes were bloodshot and red, and he complained of pain, saying, “It happens at least once a month.” I did it.

His symptoms were not simply fatigue or conjunctivitis, A doctor's diagnosis that it is a rare disease that only affects 1% of the population , which led to a huge shock and concern among fans and viewers just from the trailer alone.

2. What are the symptoms of Lee Dong-gun's rare disease?

The representative symptoms revealed by Lee Dong-gun are Bloodshot eyes with redness, severe stabbing pain in the lower trapezius muscle, sharp pain even when breathing, regular attacks once a month The doctor mentioned the possibility of a rare neurological disorder, rather than a simple eye condition. Some medical speculation suggests cluster headaches or trigeminal neuralgia.

3. Identifying the disease and estimating its cause

The exact diagnosis has not yet been revealed in the trailer. However, according to the doctor's opinion, It is believed to be an extremely rare neurological disease, as the expression “1% of the population” was used. It is possible. The following possibilities are being raised as causes.

▪️ Nerve compression or vascular abnormalities : Neck and shoulder nerve problems affecting the eyes

▪️ Stress and lifestyle habits : Irregular sleep, overwork, tension

▪️ Autonomic nervous system disorders : Accompanied by tears, runny nose, and bloodshot eyes

4. Fan and viewer reactions

After the trailer was released, online communities and social media were flooded with messages of concern, such as, "He always seemed so cheerful, but I can't believe he was suffering inside," and, "I hope he recovers his health as a person, not just as an actor." The atmosphere on set was particularly heavy, with Lee Dong-gun's mother and the studio MCs (Shin Dong-yup, Seo Jang-hoon, etc.) unable to hide their shock.

📌 FAQ

Q. What is the disease that Lee Dong-gun suffers from?
The exact diagnosis has not yet been revealed, and will be discussed in detail on the September 25th broadcast. However, cluster headaches or a rare neurological disorder are possible causes.

Q. Why do my eyes turn red?
Bloodshot eyes and bleeding may occur due to vasodilation or nervous system stimulation. This is different from simple dry eye.

Q. How severe are the symptoms?
It causes pain that is so severe that it is difficult to breathe, and it is accompanied by stabbing pain in the shoulders and neck, which greatly interferes with daily life.

Q. Is a cure possible?
Due to the nature of this rare disease, consistent management and treatment are more important than complete cure. Improving lifestyle habits and regular checkups are essential.

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