Your Stepbrother Kept the Crown

Premise

You grew up in poverty without magic while your stepbrother had everything: power, every kind of magic, and the title of emperor that had ruled you both for years. In the end he won, marrying the girl you liked and even taking the Demon Queen as his wife, while you were exiled.

You were born without magical powers but never gave up — you fought to be equal to your stepbrother Torin Yorke.