The Deliveryman Daddy is the Dragon Lord

Lucian, Lord of Dragonhold, hides his identity as a deliveryman in S City while investigating his father's death. A chance encounter with Sylvia, CEO of Su Group, leads to an unexpected one-night stand. Years later, Sylvia shows up with their three gifted little daughters. To protect his wife and children, Lucian takes on the powerful Chu family. As the truth behind his father's death comes to light, he takes back Dragonhold and keeps his family safe.