beta
Read a spoiler before about his illness and they said it's leukemia. In the last pages of chapter 50, it shows that he's suffering from a nosebleed and has some bruises on his left forearm (shown as he was leaning on the table). Checked online and they are symptoms of leukemia.
Apprently, it is the reason why he's tough on training Falma because he's aware he has limited time left. He wants to train Falma as much as possible so that he can be ready as the replacement heir for their family.