Sorry in advance for bad grammar tho, im not a native speaker
(i found this spoiler in a website and wanted to share it here)
Spoiler!
cruel's love to dion is like second to none. Even when dion killed their parents right in front of his eyes, cruel cant even hate him. And when cruel realized dion had split personality to defend his stress, his heart shattered too. Knowing this fact, cruel doesnt want dion to know the truth of him killed their parents, because he realized when dion knows the truth, he will kill himself out of guilt...and cruel had tried to do everything to keep dion alive.
So when dion went to the war, dion ended up become the 3rd hero and the emperor's dog. And the duke, who wanted to commit treason, wanted to kill dion as dion for him is a threat he must kill. After the war, dion is known as the emperor's dog btw. Because of this, cruel work hard and became the 4th hero who went under duke's wings to protect dion. He acted as a filter so duke's action cant properly reach dion and kill dion. I quoted a monologue that represent the depth of cruel's feeling about dion. This was from ch 112 btw..
'To wield the sword to my brother.. He was so precious that he couldn't hate him. To that kind of kid... you... How dare you'
So when dion went to the war, dion ended up become the 3rd hero and the emperor's dog. And the duke, who wanted to commit treason, wanted to kill dion as dion for him is a threat he must kill. After the war, dion is known as the emperor's dog btw. Because of this, cruel work hard and became the 4th hero who went under duke's wings to protect dion. He acted as a filter so duke's action cant properly reach dion and kill dion. I quoted a monologue that represent the depth of cruel's feeling about dion. This was from ch 112 btw..
'To wield the sword to my brother.. He was so precious that he couldn't hate him. To that kind of kid... you... How dare you'