Angel Meets Devil

Same name.
Different personalities.

Same person they grew up with.
Different person they came from.

Same lesson they learn.
But different understanding.

Same presents they receive.
Different wishes/things they want.

Once there was 2 boys who was raised by the same person. But they don't know each other's existence. Then one day they met each other. They become the best of friends, they treat each other like brothers.

But what if one day one of them learned the truth?
Will they stay being the best of friends and treat each like brothers?
Or will one of them will change?

Meet the boy with an angel's blood and the boy who has both angel and demon's blood.