One was meant to hold the mark of Michael 

The other was meant to hold the mark of Lucifer

One is an angel. One is a Devil

Both their goals is to eleminate the other and each side had a huge force behind them. Heaven and Hell.

When those two cross paths things are bound to get messy. They have always been told that their 'destiny' was to kill the other, but....what if fate had a different plan for those two? 

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"even the Devil was once an Angel"

once upon a time an angel and a devil fell in love...And it was said that it did not end well...