My Useless Husband Is the Supreme Archmage

For five years, legendary Archmage Rowan hides his identity to repay Serena for saving him, secretly restoring her family's noble title. She dumps him as a useless nobody right as he prepares to reveal the truth; nobles at Northwind Magic Academy humiliate him, unaware the Northern Duke kneels to him. When his identity is exposed, Serena realizes she threw away the kingdom's most powerful man.