Remarried at 50, My Husband Turns Out To Be a Billionaire! / Dominion Absolute: Crown of the Invincible

Sarah has a daughter, and Lucian has a son—they marry each other at fifty. However, she has no idea that he runs their children's elite private school—or that he's a secret billionaire! "Get out, you useless cafeteria lady!" The manager snaps at Sarah. Lucian steps protectively in front of her. "How dare you speak to my wife that way?" His voice turns cold. "From now on, she's the boss here."