What Is a Demon?

For the survival of humanity, he has no choice but to become a demon;

For the life and death of the demon race, he has no choice but to enter the ice mountains;

When humanity rejects him, all he can do is endure humiliation and shoulder the burden;

When the world misunderstands him, all he can do is grit his teeth and bear it;

But one day, he and she

will be forced to face each other because they stand on opposing sides.

What will they choose?