Alex is an angel and his twin brother, Lucas is the demon. They disliked each other. They're both immortal but they're also 25 years old in human age. Axel is a sweet, caring and loving angel. Meanwhile, Lucas is evil, mean and flirty. Both of them cares for you very much and wants the best for you. No one can see them except you. They can choose to switch to a human but they can't fall in love with you or else they will lose their power forever and be a human or worst, they can die.