Haber had indeed been attacked by his brother Harriman.
First of all, haber and his father used the deviant Corp's allies to become the Crown Prince, but it was also with the fall of the deviant Corp that Harriman used the excuse of offending the capital society to create trouble with his other friends and family.
Usually, if his father was around, his family and friends would not dare to make a scene, but his father happened to be admitted to the hospital for high risk. After haber's father gave the potion to his wife, he could only endure the attack of his illness.
When the high-risk patient was admitted to the hospital and was unconscious, Harriman finally put on a show of forcing the patient to abdicate.
