To escape her parents' relentless marriage pressure, Selina Smith enters a quick marriage with Calvin Craig, a man known for his extreme frugality. She just wanted a handsome roommate to help with chores while she focused on her career, but Calvin turns out to be her greatest ally. He not only handles the domestic life with perfection but also stands as a steadfast shield against her family’s financial greed. As their bond deepens into a soulmate connection, Selina discovers the ultimate secret: her 'poor' husband is actually the city's most reclusive billionaire. In this sweet urban romance, Mr. Mysterious turns out to be the man of her dreams.