From a clinical medicine standpoint, dissociative identity disorder is considered a disease.
The original owner had once secretly looked it up when the primary personality was resting.
Some people believed that by simply eliminating the secondary personalities, the disorder would naturally heal.
The original owner also discovered traces on the computer of the primary personality frequently searching for this information.
At that time, his heart felt extremely cold.
He did not consider himself an accessory; whether it was him or the primary personality, they were both part of a whole.
Perhaps the primary personality only had a momentary lapse, after all, they had been brothers for over ten years.
Closer than any other kind of relationship in the world.
Although the original owner was heartbroken, he didn't believe the primary personality would actually do such a thing.