I'm ok with the ml being the blue haired guy or the demon king (evan)

Evan (the antagonist of this story after all has not shown any good qualities, nobody speaks well of him, all the disciples hate him for his personality and declared war on him), he is going to transform into the villain beast (but he is waiting for a excuse, for him to do that. He does not like to accept his mistakes, doing so means that he loses and must pay for them.)