Bad Boy is a Demon

In from the past, a boy who is powerful demon named Devon,he is a demon because his family were demons so he came to Earth of Human cause his family died from their enemies.A girl who is very weak and unhealthy human named Ruby,she is a human which her family died from the demons came then she left her childhood friend Devon cause she got moved to another house with her Aunt.Until the future,they met each other while Devon finally remember Ruby his childhood friend but Devon can't stop falling for her while Ruby had crush on Dean, Devon's enemy.