I think it’s because he was the divine being everyone was praying to for salvation, and also a member of the royal family, crown prince, he saw firsthand what was going on there with the disease that was spreading, he met Doram back when he was a child and promised to take care of him and in the end being A DIVINE BEING he couldn’t do anything… Come on, he is a huge black flying tiger who can snap things and necks from afar, who has an unnatural sharp sense of hearing, can basically teleport… I would be pissed off too, why going around promising things you cannot bother to do? ( ̄へ ̄)
SEE... I don't get why he would NOT understand that even the prince himself did not know about his circumstances at the time, could not hear him from that distance, etc. etc. like I genuinely don't get it because the KNOWLEDGE everybody had at that time was different, and I don't understand why there could still be room for hatred now like genuinely if we don't stretch the plot at all the crown prince was also basically innocent so? so much for doram's forgiving heart I guess
How will he understand? The guy is the son of the person that slaughtered his entire family(including his extended family), forced his hyung into slavery, made him run away for his life and fake his death and separate from his brother. All of a sudden he’s related to that family by marriage??? His hatred is human and very valid not to mention the tiger has still not formally apologized. It’s easy to see the prince as innocent from the readers perspective but try to see it from the brothers pov

mind telling me why the younger brother hates the ML?